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You certainly do not have to agree to change the completion date to suit your buyers, but if you do, it is very important you tell your solicitor so he can then vary the contract formally.

Ideally, your solicitor should prepare a supplemental agreement changing the completion date and your buyers should pay your solicitor's costs for drafting it. Both you and the buyers will need to sign the supplemental agreement.

§ 120.530 Deferment of payment.

SBA may agree to defer payments on a business loan for a stated period of time, and use such other methods as it considers necessary and appropriate to help in the successful operation of the Borrower. (13 CFR 120.530, law.cornell.edu)

A mutual legal assistance treaty (MLAT) is an agreement between two or more countries for the purpose of gathering and exchanging information in an effort to enforce public laws or criminal laws. First ones are very important in tax matters, in particular as part of international double taxation agreements wherein the parties agree to deliver information for tax purposes. (Wikipedia)

With the amendments, parties may agree to avoid restrictions imposed by arbitration rules on the choice of arbitrators among those listed by the arbitration institution. (mondaq.com)