Residential Rental Forms. Month-to-month tenancies can be verbal or written.Verbal rental agreements are legal in Washington State and are considered to be month-to-month tenancies. A Washington monthtomonth lease agreement allows a landlord to rent out their property to a tenant one month at a time. The Washington lease agreement is the most common type of lease form and can be used for leasing rental property over a fixed period. This guide covers most people who pay rent for the place where they live (called residential tenants) in Washington State. Download a Washington monthtomonth rental agreement so you can rent out a property to a tenant on a monthly basis. Many leases automatically roll over into a month-to-month tenancy but must say so in the lease language. A Washington standard residential lease agreement is a oneyear rental contract between a residential landlord and their tenant. Two-year leases are only valid if they are notarized.