Standard Lease Agreement (City of Seattle version) – The most popular rental contract with a start and end date and rent that is due on the first of each month. Residential Rental Forms.How do I fill this out? Filling out this lease agreement is straightforward. A Washington standard residential lease agreement is a oneyear rental contract between a residential landlord and their tenant. A Washington standard residential lease agreement is a legal document that landlords and tenants use to guide the rental of a property rental. Our Washington lease agreement template can help you form your lease agreement. It's available to download as a PDF or Word file. The Washington (state) rental agreements are contracts and forms designed to aid in the process of renting residential or commercial property to a tenant. Set the terms for renting property.