020) since January 1, 1995. 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? To be used in transfers of improved residential real property, including residential dwellings up to four units, new construction,. The Form 17 permits a seller to mark answers to the form questions as "Yes", "No", "I don't know", and "NA." A real estate contract washington is, at its core, a legally binding agreement made between two or more parties in a Washington real estate deal. Does the owner of a manufactured home that sits on leased land have to fill out Form 17 in Washington State? Fill out the rest of form. GovDelivery Subscribe Sign up to receive updates.