Residential Rental Forms. A Washington lease agreement is a document that outlines the terms of a rental between a landlord and a tenant.A Washington rental application is a key document that should be dispersed anytime an individual requests to lease a particular property. Washington Sample Forms. Prepare a free Washington rental application form for your individual needs today with step-by-step instructions and expertly prepared . Property Owner or Authorized Manager: Complete all sections below with only the information you know to be true. Write "unknown" to questions you can't answer. Create a customized Washington rental application from our attorneydrafted template so you can properly vet potential tenants for a lease.