(a) A valid contract is binding upon the parties. It can only be modified or terminated by consent of the parties or if provided for by the law. The parties to a contract must, unless legally excused from performance, perform their respective duties under the contract ("pacta sunt servanda").
(b) A valid unilateral promise or undertaking is binding on the party giving it if that promise or undertaking is intended to be legally binding without acceptance.
The Mortgagor shall duly and punctually perform and serve all of the material terms, covenants and conditions of the Space Leases required to be performed and observed by it as landlord thereunder substantially in accordance with the terms thereof. The Mortgagor will further do all things reasonably necessary to preserve and keep unimpaired its rights under all Space Leases. The Mortgagor shall require all Space Tenants to observe, keep and perform all material covenants and agreements imposed upon them under the Space Leases. The Mortgagor shall appear in and defend any action or proceeding arising under or in any manner connected with any of the Space Leases.
This Trust Agreement and the Trust shall be irrevocable and, except as provided in Section X hereof, unamendable except that the Board of Governors may terminate or amend its authorization pursuant to Section 13(3) of the Federal Reserve Act, thereby revoking or amending the Trust in accordance with Federal law, provided, however, that a Trustee's rights to resign as a trustee hereunder and to compensation and indemnification with respect to acts or omissions occurring prior to any such revocation or amendment may not be modified without the written consent of that Trustee.