By law, most sellers of real property must provide a completed Seller Disclosure Statement (aka Form 17) to any buyer. The Form 17 permits a seller to mark answers to the form questions as "Yes", "No", "I don't know", and "NA."To be used in transfers of improved residential real property, including residential dwellings up to four units, new construction,. Form 17 Seller Disclosures and the most commonly asked questions. We also go over the changes that took effect today. You must fill out a Seller Disclosure Statement (also known as Form 17). You must tell the buyer any problems with the property that you know about. The seller disclosure statement, also known as a seller disclosure form or Form17 is a crucial document that sellers must complete when selling their home. The seller disclosure statement, also known as a seller disclosure form or Form17 is a crucial document that sellers must complete when selling their home. Otherwise agreed, after mutual acceptance of a written purchase and sale agreement between Buyer and Seller.