Section 15-501 - Executory accord1. Executory accord as used in this section means an agreement embodying a promise express or implied to accept at some future time a stipulated performance in satisfaction or discharge in whole or in part of any present claim, cause of action, contract, obligation, or lease, or any mortgage or other security interest in personal or real property, and a promise express or implied to render such performance in satisfaction or in discharge of such claim, cause of action, contract, obligation, lease, mortgage or security interest.2. An executory accord shall not be denied effect as a defense or as the basis of an action or counterclaim by reason of the fact that the satisfaction or discharge of the claim, cause of action, contract, obligation, lease, mortgage or other security interest which is the subject of the accord was to occur at a time after the making of the accord, provided the promise of the party against whom it is sought to enforce the accord is in writing and signed by such party or by his agent. If executed by an agent, any promise required by this section to be in writing which affects or relates to real property or an interest therein as defined in section 5-101 in any manner stated in subdivisions one or two of section 5-703 of this chapter shall be void unless such agent was thereunto authorized in writing.3. If an executory accord is not performed according to its terms by one party, the other party shall be entitled either to assert his rights under the claim, cause of action, contract, obligation, lease, mortgage or other security interest which is the subject of the accord, or to assert his right under the accord.N.Y. Gen. Oblig. Law § 15-501