What to Know Before You Buy or Sell: Form 17 Seller Disclosure Statement. I'm going to show you how to send the form 17 to your sellers have them be able to fill out all of the boxes get it back and then be able to deliver it.A Washington residential purchase agreement is a legally binding contract between the buyer and the seller of a home. Withing five days of accepting the buyer's offer, the seller must provide the buyer with a Seller's Disclosure Statement, also called "Form 17". I agree with Mr. Nelson and the PR does not need to produce the form 17. Washington just enacted a new law that requires home buyers to sign an agency agreement with their real estate agent as soon as they start working together. Sellers are required to provide the filled-out form to buyers before each signs the purchase agreement. Does the owner of a manufactured home that sits on leased land have to fill out Form 17 in Washington State? If you are using the Arizona Association of REALTORS® ("AAR") Residential Resale Real Estate Purchase. Gov website belongs to an official government organization in the United States.