020) since January 1, 1995. 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".Any non-exempt seller is obligated to complete the disclosure form even if the seller does not occupy or has never occupied the property. The Seller Disclosure Statement in Washington (aka Form 17) is a mandatory form all sellers must complete and give to their buyers. Sellers who wish to see or use the basic disclosure form can find the form on the Web site of the Pennsylvania State Real Estate Commission. By law, most sellers of real property must provide a completed Seller Disclosure Statement (aka Form 17) to any buyer. I am An Heir, Does A Personal Representative Need To Submit A Seller Disclosure Form 17 On The Sale Of Real Property? State law in Washington (2021 Revised Code of Washington § 64.06. 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. 4 The Real Estate Seller Disclosure Law (68 P.S. §7301, et seq.) requires that before an agreement of sale is signed, the seller in a residential.