Contract Law
Regarding the sale and purchase of a property, please explain any legal principals which would limit the ability to change the terms of the contract once all parties have signed a written agreement.
Re: Contract Law
You cannot change the terms of a signed, written agreement without the consent of all parties to the contract unless the contract somehow reserves that right. Such reservation could be contingency, or as to a minor point only. The theory is that the written agreement makes the obligations of all parties clear to the others.