A Lease Extension Agreement Month to Month (also known as a Renewal Agreement) is an agreement between two parties that codifies the extension of an existing lease into a month-to-month tenancy. Generally, these agreements can be used to extend a lease which is ending and has no existing renewal clause or to replace an existing periodic tenant’s lease with malleable terms. Under the terms of a Lease Extension Agreement Month to Month, either party may give written notice prior to termination in order for the agreement to remain valid. This makes it an ideal solution for landlord-tenant relationships where flexibility is desired.