Dorado v. Loew’s, Inc., D.C.Mun.App., 88 A.2d 188, relied on by appellants is not in point. That case dealt with the nature and effect of an advance agreement for a shortened notice period and with the necessity of complying with the statutory termination date. In our case there was a new agreement based on mutual considerations for terminating the tenancy by notice, surrender and acceptance. When the tenants performed their part of the agreement, the landlords’ liability to perform their part was established. It is by no means a novel doctrine that parties to a contract may modify, rescind or discharge it by subsequent oral agreement. Nickel v. Scott, D.C.Mun.App., 59 A.2d 206, and cases there cited. Affirmed. 1