A lease is not a single transaction or sale, but a contract for a series of transactions. A lease or rental to the consumer is considered a retail sale.A Washington lease agreement is a document that outlines the terms of a rental between a landlord and a tenant. Washington Lease Agreements: A 2024 Guide for seamless rentals. Expert tips, legal insights, and valuable resources for hassle-free leasing. Lease agreements in Washington are legal contracts between landlords and tenants. They establish key details like rent amount, duration, and property rules. A recycled Washington lease agreement can cause headaches. You can create a new, compliant lease with our lease builder in minutes. Certain things are illegal to put in rental agreements.