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 am An Heir, Does A Personal Representative Need To Submit A Seller Disclosure Form 17 On The Sale Of Real Property?No state mandated purchase form. When a broker is used, the licensee is responsible for ensuring the form is complete with clear and definite terms. By law, most sellers of real property must provide a completed Seller Disclosure Statement (aka Form 17) to any buyer. Does the owner of a manufactured home that sits on leased land have to fill out Form 17 in Washington State? Gov website belongs to an official government organization in the United States. The Form 17 is governed under Chapter 64.06 of the Revised Code of Washington, and in the case of improved residential real estate, RCW 64.06. Sellers are required to provide the filled-out form to buyers before each signs the purchase agreement. Will a Change in the Terms and Conditions of Employment Provide.