Lease Agreements are supposed to last until the end date given in the agreement, unless it is a month-to-month lease. This is to provide a clear beginning and end date to the term of the lease and to protect both the landlord and the tenant. There are other important terms in a Lease Agreement, usually having to do with rent payments, security deposits, maintenance, and specifics about how many tenants are on the lease. Because these terms are central to the rental agreement, they may not be.