Creation of the Trust The Trust is hereby created and shall be known as “Washington Mutual Mortgage Pass-Through Certificates WMALT Series 2005-7 Trust”. The purpose of the Trust is, and the Trust shall have the power and authority, to engage in the following activities, all as provided by and subject to the terms of this Agreement: (i) to acquire, hold, lease, manage, administer, control, invest, reinvest, operate and/or transfer the Mortgage Pool Assets, the REMIC II Assets, the REMIC III Assets and the Yield Maintenance Agreement; (ii) to issue the REMIC I Regular Interests, the REMIC II Regular Interests, the REMIC III Regular Interests, the Class R-1, Class R-2 and Class R-3 Residual Interests and the Certificates; (iii) to make distributions to the REMIC I Regular Interests, the REMIC II Regular Interests, the REMIC III Regular Interests and the Certificates; and (iv) to engage in such other activities, including entering into agreements, as are described in or required by the terms of this Agreement or as are necessary, suitable or convenient to accomplish the foregoing or incidental thereto. LaSalle Bank National Association is hereby appointed as a trustee of the Trust, to have all the rights, duties and obligations of the Trustee with respect to the Trust expressly set forth hereunder, and LaSalle Bank National Association hereby accepts such appointment and the Trust created hereby. Christiana Bank & Trust Company is hereby appointed as a Delaware trustee of the Trust, to have all the rights, duties and obligations of the Delaware Trustee with respect to the Trust hereunder, and Christiana Bank & Trust Company hereby accepts such appointment and the Trust created hereby. It is the intention of the Company, the Servicer, the Trustee and the Delaware Trustee that the Trust constitute a statutory trust under the Statutory Trust Statute, that this Agreement constitute the governing instrument of the Trust, and that this Agreement amend and restate the Original Trust Agreement. The parties hereto acknowledge and agree that, prior to the execution and delivery hereof, the Delaware Trustee has filed the Certificate of Trust. The parties hereto acknowledge that the Trust includes three separate pools of mortgage loans referred to herein as “Loan Groups” constituting separate subtrusts for ERISA purposes, and that the assets of each Loan Group are available to make payments to the holders of Certificates as provided in the definitions of “REMIC I Distribution Amount,” “REMIC II Distribution Amount” and “REMIC III Distribution Amount,” Section 4.01, Section 4.04 and Section 4.05 hereof. The assets of the Trust shall remain in the custody of the Trustee (or Custodian), on behalf of the Trust, and shall be owned by the Trust except as otherwise expressly set forth herein. Moneys to the credit of the Trust shall be held by the Trustee and invested as provided herein. All assets received and held in the Trust will not be subject to any right, charge, security interest, lien or claim of any kind in favor of either of LaSalle Bank National Association or Christiana Bank & Trust Company in its own right, or any Person claiming through it. Neither the Trustee nor the Delaware Trustee, on behalf of the Trust, shall have the power or authority to transfer, assign, hypothecate, pledge or otherwise dispose of any of the assets of the Trust to any Person, except as permitted herein. No creditor of a beneficiary of the Trust, of the Trustee, of the Delaware Trustee, of the Servicer or of the Company shall have any right to obtain possession of, or otherwise exercise legal or equitable remedies with respect to, the property of the Trust, except in accordance with the terms of this Agreement.