Common use of WASHINGTON MUTUAL MORTGAGE SECURITIES CORP Clause in Contracts

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10] Exhibit A CUSIP 92922F DU 9 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. DEUTSCHE BANK TRUST COMPANY DELAWARE, as Delaware Trustee BY: /s/ Xxxxxxxxx X. Xxxxx —————————————————————————— Name: Xxxxxxxxx X. Xxxxx Title: Assistant Vice President [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR5] Appendix 1 Copies of Appendix 1 (which has been intentionally omitted from this filing) may be obtained from Washington Mutual Mortgage Securities Corp. or Deutsche Bank National Trust Company by contacting, in the case of Washington Mutual Mortgage Securities Corp., Xxxxx Xxxxxx Master Servicing Department Washington Mutual Mortgage Securities Corp. 00 X. Xxxxxxx Xxxxx,XXX0X00 Xxxxxx Xxxxx, XX 00000 Telephone: (000) 000-0000 Facsimile: (000) 000-0000 in the case of Deutsche Bank National Trust Company, Xxxx Xxxxx Trust Administrator Deutsche Bank National Trust Company 0000 X. Xx. Xxxxxx Xxxxx Santa Ana, CA 92705 Telephone: (000) 000-0000 Facsimile: (000) 000-0000 Exhibit A CUSIP 92922F DU 9 929227 Q8 2 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- one-to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR5 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24April 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY FEBRUARY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR6] Exhibit A CUSIP 92922F DU 9 929227 4D 5 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR6 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24May 23, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR6 Portion of the Class A-1 Principal Balance as of the Cut-Off Date Evidenced by this Certificate: $1,312,286,100.00 Class A-1 Certificate Interest Rate: Variable Cut-Off Date: May 1, 2003 First Distribution Date: June 25, 2003 Last Scheduled Distribution Date: June 25, 2033 Class A-1 Principal Balance as of the Cut-Off Date: $1,312,286,100.00 Cede & Co. Registered Owner Exhibit A CUSIP 929227 4E 3 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR6 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is May 23, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR6 Portion of the Class A-2 Principal Balance as of the Cut-Off Date Evidenced by this Certificate: $454,392,000.00 Class A-2 Certificate Interest Rate: Variable Cut-Off Date: May 1, 2003 First Distribution Date: June 25, 2003 Last Scheduled Distribution Date: June 25, 2033 Class A-2 Principal Balance as of the Cut-Off Date: $454,392,000.00 Cede & Co. Registered Owner Exhibit A CUSIP 929227 4F 0 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class X-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR6 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is May 23, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR6 Portion of the Class X-1 Notional Amount as of the Cut-Off Date Evidenced by this Certificate: $1,312,286,100.00 Class X-1 Certificate Interest Rate: 0.059%, applied to the Class X-1 Notional Amount Cut-Off Date: May 1, 2003 First Distribution Date: June 25, 2003 Last Scheduled Distribution Date: May 25, 2008 Class X-1 Principal Balance as of the Cut-Off Date: $0.00 Class X-1 Notional Amount as of the Cut-Off Date: $1,312,286,100.00 Cede & Co. Registered Owner Exhibit A CUSIP 929227 4G 8 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class X-2 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR6 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is May 23, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR6 Portion of the Class X-2 Notional Amount as of the Cut-Off Date Evidenced by this Certificate: $454,392,000.00 Class X-2 Certificate Interest Rate: 0.371%, applied to the Class X-2 Notional Amount Cut-Off Date: May 1, 2003 First Distribution Date: June 25, 2003 Last Scheduled Distribution Date: May 25, 2008 Class X-2 Principal Balance as of the Cut-Off Date: $0.00 Class X-2 Notional Amount as of the Cut-Off Date: $454,392,000.00 Cede & Co. Registered Owner Exhibit A CUSIP 929227 4H 6 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class B-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR6 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended (the “Code”). The issue date of this Certificate is May 23, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 B-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h5.01(g) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 B-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR9] Exhibit A CUSIP 92922F DU 9 BP 2 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR9 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24August 26, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS I-A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS I-A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10] BY: /s/ Xxxxx X. Xxxxxx —————————————————————————— Name: Xxxxx X. Xxxxxx Title: First Vice President DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee BY: /s/ Xxxxxxx Xxxxxxx —————————————————————————— Name: Xxxxxxx Xxxxxxx Title: Assistant Secretary BY: /s/ Xxxxxxx Xxxxx —————————————————————————— Name: Xxxxxxx Xxxxx Title: Associate DEUTSCHE BANK TRUST COMPANY DELAWARE, as Delaware Trustee BY: /s/ Xxxxxxxxx X. Xxxxx —————————————————————————— Name: Xxxxxxxxx X. Xxxxx Title: Assistant Vice President Exhibit A CUSIP 92922F DU 9 939336 NX 7 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR1 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended, together with certain rights specified in the Pooling Agreement. The issue date of this Certificate is September 24January 28, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 NOVEMBER 2007 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. BY: /s/ Xxxxxxx X. Xxxxxx —————————————————————————— Name: Xxxxxxx X. Xxxxxx Title: President [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR7] Exhibit A CUSIP 92922F DU 9 929227 6D 3 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR7 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24June 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY APRIL 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10] BY: /s/ Xxxxxxx X. Xxxxxx —————————————————————————— Name: Xxxxxxx X. Xxxxxx Title: Vice President DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee BY: /s/ Xxxxxxx Xxxxxxx —————————————————————————— Name: Xxxxxxx Xxxxxxx Title: Assistant Secretary BY: /s/ Xxxxxxx Xxxxx —————————————————————————— Name: Xxxxxxx Xxxxx Title: Associate DEUTSCHE BANK TRUST COMPANY DELAWARE, as Delaware Trustee BY: /s/ Xxxxxxxxx X. Xxxxx —————————————————————————— Name: Xxxxxxxxx X. Xxxxx Title: Assistant Vice President Exhibit A CUSIP 92922F DU 9 929227 L3 8 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR4 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24March 21, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY JANUARY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. BY: /s/ Xxxxxxx X. Xxxxxx —————————————————————————— Name: Xxxxxxx X. Xxxxxx Title: Vice President DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee BY: /s/ Xxxxxxx Xxxxxxx —————————————————————————— Name: Xxxxxxx Xxxxxxx Title: Assistant Secretary BY: /s/ Xxxxxxx Xxxxx —————————————————————————— Name: Xxxxxxx Xxxxx Title: Associate DEUTSCHE BANK TRUST COMPANY DELAWARE, as Delaware Trustee BY: /s/ Xxxxxx X. Xxxxxxxx —————————————————————————— Name: Xxxxxx X. Xxxxxxxx Title: Associate [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR3] Exhibit A CUSIP 92922F DU 9 929227 F9 2 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 A-1A Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR3 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended, together with certain rights specified in the Pooling Agreement. The issue date of this Certificate is September 24February 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 A-1A CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY FEBRUARY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 A-1A CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10] By: ---------------------------------------- Name: Title: BANKERS TRUST COMPANY OF CALIFORNIA, N.A., as Trustee By: ---------------------------------------- Name: Title: Exhibit A CUSIP 92922F DU 9 929227 HP 4 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 Evidencing a beneficial interest Percentage Interest in a pool trust fund whose assets consist of assets consisting of beneficial interests in another pool of trust fund whose assets consisting consist of, among other things, a pool of conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 Trust. This Certificate represents ownership of a “"regular interest” " in a “"real estate mortgage investment conduit,” " as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24December 14, 20032001. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“"DTC”"), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 OCTOBER 2006 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S 'S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S 'S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S 'S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY:

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. BY: /s/ Xxxxxx X. Xxxxxxx —————————————————————————— Name: Xxxxxx X. Xxxxxxx Title: First Vice President [Signature page to Pooling and Servicing Agreement for WaMu Series 2003-AR10AR8] Exhibit A CUSIP 92922F DU 9 AS7 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-1 A Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR10 AR8 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is September 24July 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR8 Portion of the Class A Principal Balance as of the Cut-Off Date Evidenced by this Certificate: $1,214,965,000.00 Class A Certificate Interest Rate: Variable Cut-Off Date: July 1, 2003 First Distribution Date: August 25, 2003 Last Scheduled Distribution Date: August 25, 2033 Class A Principal Balance as of the Cut-Off Date: $1,214,965,000.00 Cede & Co. Registered Owner Exhibit A CUSIP 92922F AT5 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class X Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR8 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is July 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. Series 2003-AR8 Portion of the Class X Notional Amount as of the Cut-Off Date Evidenced by this Certificate: $1,214,965,000.00 Class X Certificate Interest Rate: Variable, applied to the Class X Notional Amount Cut-Off Date: July 1, 2003 First Distribution Date: August 25, 2003 Last Scheduled Distribution Date: July 25, 2008 Class X Principal Balance as of the Cut-Off Date: $0.00 Class X Notional Amount as of the Cut-Off Date: $1,214,965,000.00 Cede & Co. Registered Owner Exhibit A CUSIP 92922F AU2 WaMu MORTGAGE PASS-THROUGH CERTIFICATE Evidencing a beneficial interest in a pool of assets consisting of beneficial interests in another pool of assets consisting of, among other things, conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate is issued by WaMu Mortgage Pass-Through Certificates Series 2003-AR8 Trust. This Certificate represents ownership of a “regular interest” in a “real estate mortgage investment conduit,” as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended (the “Code”). The issue date of this Certificate is July 25, 2003. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1 B-1 CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN JULY 2008 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER’S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(h5.01(g) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER’S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE, AND WILL NOT SUBJECT THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUST, THE TRUSTEE, THE MASTER SERVICER OR THE COMPANY. NOTWITHSTANDING THE FOREGOING PARAGRAPH, WITH RESPECT TO THE TRANSFER OF THIS CLASS A-1 B-1 CERTIFICATE TO DTC OR ANY OTHER CLEARING AGENCY OR ANY SUBSEQUENT TRANSFER OF ANY INTEREST IN THIS CERTIFICATE FOR SO LONG AS THIS CERTIFICATE IS HELD BY DTC OR ANY OTHER CLEARING AGENCY, (I) AN OFFICER’S CERTIFICATE (AND, IF APPLICABLE, A BENEFIT PLAN OPINION), AS DESCRIBED IN THE FOREGOING PARAGRAPH, SHALL NOT BE REQUIRED, AND (II) THE FOLLOWING CONDITIONS SHALL APPLY: