Learn more about the NWMLS Form 17 (or Seller Disclosure Statement). Almost all sellers in WA must complete and provide one to a buyer.Hey Buddy Buck here! Application—Exceptions for certain transfers of real property. Almost every home seller in WA must complete a Seller Disclosure Statement, aka the Form 17. Learn more, and get a copy you can use for free! Completion and review of the Seller Disclosure Statement, Form 17, happens (or should happen) in nearly every transaction. In most realestate transactions in Washington, the seller of the property must complete a "Form 17" disclosure statement and give it to the buyer. Hey Buddy Buck here! While relaxing in your new living room, you look up and notice a water spot in the ceiling.