Washington Land Contract Template. A Washington land contract is a formal sale agreement between two parties transferring ownership of vacant real estate.Learn how to fill out the Washington state vacant land purchase and sale agreement in our step-by-step guide! The Washington Land Purchase Agreement form is a legally binding document that outlines the terms and conditions under which land is sold and purchased. Customize the agreement: Fill in the template with specific details of the transaction. A Washington purchase agreement documents the sale of a piece of real property for a specified financial figure. Edit, sign, and share washington state vacant land purchase and sale agreement form 25 online. A land purchase contract outlines a transaction between a seller who agrees to sell raw land to a buyer for an agreed-upon sales price. If this Agreement is for conveyance of a buyer's interest in a Real Estate. This file contains detailed instructions for completing the NWMLS Form No. 21, a Residential Real Estate Purchase and Sale Agreement.