Hey Buddy Buck here! By law, most sellers of real property must provide a completed Seller Disclosure Statement (aka Form 17) to any buyer.It discloses your first-hand knowledge about the property. It's about five or six pages long and it covers all the systems of the house. 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! To be used in transfers of improved residential real property, including residential dwellings up to four units, new construction,. Nearly all real estate sales in Washington State require a seller disclosure statement, also known as Form 17, to be given to the buyer. Most tenants who rent a place to live come under the state's Residential Landlord-Tenant. Act. However, certain renters are specifically excluded from the law.