Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 Sample Contracts

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 29th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 29th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 27th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 28th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 26th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 26th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 29th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 27th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 29th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 27th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 27th, 2005)

The Class B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated March 24, 2005 to that certain Prospectus Supplement, dated March 21, 2005, to which certain Group I, II,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II,and III Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2005-2 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and WASHINGTON MUTUAL BANK, FA, as Servicer and LASALLE BANK NATIONAL ASSOCIATION, as Trustee and CHRISTIANA BANK & TRUST COMPANY, (April 12th, 2005)

This Pooling and Servicing Agreement, dated and effective as of March 1, 2005 (this “Agreement”), is executed by and among Washington Mutual Mortgage Securities Corp., as depositor (the “Company”), Washington Mutual Bank, FA, as Servicer (the “Servicer”), LaSalle Bank National Association, a national banking association with a corporate trust office at 135 South LaSalle Street, Suite 1625, Chicago, Illinois 60603, as Trustee (the “Trustee”), and Christiana Bank & Trust Company, as Delaware Trustee (the “Delaware Trustee”). Capitalized terms used in this Agreement and not otherwise defined have the meanings ascribed to such terms in Article I hereof.