Common use of The Certificate Account Clause in Contracts

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 2005-AR2 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR14 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR12 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052004-AR2 RA4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-7 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 7 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS1 Trust created pursuant thereto”. ." Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS2 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts 107 previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS2 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR19 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.any

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR11 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-9 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 9 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Bankers Trust Company (Delaware), as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR1 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR6 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S13 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR5 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS4 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS8 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest and the Certificate Insurer are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement. The Trustee shall deposit into the Certificate Account amounts received under the Certificate Insurance Policy in accordance with Section 3.21(b) hereof.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassState Street Bank and Trust Company, Trustee, on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”MS11 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Bankers Trust Company (Delaware), as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS4 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR11 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-8 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 8 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR15 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS9 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR8 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the 91 Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS10 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 AR3 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR4 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR10 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S8 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR12 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 CB1 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS6 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National and Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassBankers Trust Company of California, N.A., on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”AR4 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 S6 Trust created pursuant thereto”, on behalf of the Series 2002-S6 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR5 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-2 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, FA, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 2 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and Interests, the Class R-1 Residual Interest and the Certificate Insurer are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement. The Trustee shall deposit into the Certificate Account amounts received under the Certificate Insurance Policy in accordance with Section 3.21(b) hereof.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052004-AR2 RA2 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassState Street Bank and Trust Company, Trustee, on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”. MS10 Certificateholders." Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. 110 Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS5 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S5 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR13 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-4 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and Interests, the Class R-1 Residual Interest and the Certificate Insurer are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement. The Trustee shall deposit into the Certificate Account amounts received under the Certificate Insurance Policy in accordance with Section 3.21(b) hereof.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR3 Trust created pursuant thereto”. .” Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National and Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassBankers Trust Company of California, N.A., on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”AR6 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and Interests, the Class R-1 Residual Interest and the Certificate Insurer are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the 66 Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement. The Trustee shall deposit into the Certificate Account amounts received under the Certificate Insurance Policy in accordance with Section 3.21(b) hereof.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR14 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S2 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-1 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, FA, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-10 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 10 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 S8 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January December 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS11 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR7 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 MS8 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR9 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 CB4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 MS7 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest and the Certificate Insurer are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement. The Trustee shall deposit into the Certificate Account amounts received under the Certificate Insurance Policy in accordance with Section 3.21(b) hereof.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 AR4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR6 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR16 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR11 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR5 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR8 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052003-AR2 AR1 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-3 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 3 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S7 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 S5 Trust created pursuant thereto”. , on behalf of the Series 2002-S5 Certificate Holders." Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 S3 Trust created pursuant thereto”, on behalf of the Series 2002-S3 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January August 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR9 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 AR1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR7 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-5 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 5 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National and Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassBankers Trust Company of California, N.A., on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”AR3 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Bankers Trust Company (Delaware), as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR3 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR3 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 S3 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish or cause to be established the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Pass-Through Certificates WMALT Series 2005-6 Trust Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-AR2 6 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as the Trustee, and Deutsche Bank Bankers Trust Company (Delaware), as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR4 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR8 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052001, among between Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassState Street Bank and Trust Company, Trustee, on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”S11 Certificateholders". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S9 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR12 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January May 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR6 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust CompanyCitibank, N.A., as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 CB2 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January June 1, 2005, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Depositor, Washington Mutual Bank, as Servicer, Deutsche LaSalle Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 2005-AR2 AR7 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January February 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of the WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052004, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052004-AR2 AR13 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January October 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Companyand JPMorgan Chase Bank, as the Trustee, and Deutsche Chase Manhattan Bank Trust Company DelawareUSA, National Association, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 S7 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect 98 of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR1 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January July 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR9 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest Certificates are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January April 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S3 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January March 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 AR4 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche Bank National Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052002-AR2 AR18 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052001, among between 120 Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Bank Trust Company Delaware, as the Delaware Trustee, for the benefit of WaMu Mortgage PassState Street Bank and Trust Company, Trustee, on behalf of the Series 2001-Through Certificates Series 2005-AR2 Trust created pursuant thereto”. MS14 Certificateholders." Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “"Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January November 1, 20052002, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and State Street Bank National and Trust Company, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20052002-AR2 AR3 Trust created pursuant thereto”". Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.

The Certificate Account. (a) On or prior to the Closing Date, the Trustee shall establish the Certificate Account, which shall be entitled “Washington Mutual Mortgage Securities Corp. Certificate Account under the Pooling and Servicing Agreement, dated as of January September 1, 20052003, among Washington Mutual Mortgage Securities Corp., as Depositor and Master Servicer, Deutsche and U.S. Bank National Trust CompanyAssociation, as the Trustee, and Deutsche Christiana Bank & Trust Company DelawareCompany, as the Delaware Trustee, for the benefit of WaMu Mortgage Pass-Through Certificates Series 20052003-AR2 S10 Trust created pursuant thereto”. Promptly after the Closing Date, the Trustee shall communicate to the Master Servicer the account number and wiring instructions for the Certificate Account. Not later than the Business Day prior to the related Distribution Date, the Master Servicer shall direct the Investment Depository to deposit into the Certificate Account the amounts previously deposited into the Investment Account (which may include a deposit of Eligible Investments) to which the Holders of the REMIC I Regular Interests and the Class R-1 Residual Interest are entitled or which are necessary for payment of any Special Primary Insurance Premiums. In addition, not later than the Business Day prior to the Distribution Date, the Master Servicer shall deposit into the Certificate Account any Monthly P&I Advances or other payments required to be made by the Master Servicer pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or Liquidation Proceeds (including amounts paid by the Company in respect of any Purchase Obligation) not previously deposited in the Custodial Accounts for P&I or the Investment Account, and any amounts paid by the Master Servicer in connection with the exercise of its option to terminate this Agreement pursuant to Section 9.01 or any other purchase of Mortgage Loans permitted by this Agreement.