Learn how to fill out the Washington state vacant land purchase and sale agreement in our step-by-step guide! Washington Land Contract Template.A Washington land contract is a formal sale agreement between two parties transferring ownership of vacant real estate. Contract by, through, or under persons other than the Seller herein. Any personal property included in the sale shall be included in the fulfillment deed. Download Washington Land Purchase Agreement template, modify and send for signing using BoloForms Signature. The Washington Land Purchase Agreement form is a legally binding document that outlines the terms and conditions under which land is sold and purchased. 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. To fill out this agreement, first provide the date and the names of the Seller and Buyer. I am going to show you how to write up a purchase and sale agreement on vacant land property.