Massachusetts requires those selling FSBO to fill out and file many documents and forms. Several of these documents are legally binding agreements.Learn how to craft a professional FSBO (For Sale By Owner) contract in Massachusetts with this comprehensive step-by-step guide. A For Sale By Owner contract Massachusetts must include: 1. The Purchase Price, 2. A Massachusetts purchase agreement is the standard legal form for selling or purchasing a home. It documents the transaction's stipulations. You'll need to fill out or obtain at least 14 documents, including the purchase agreement, closing statement, and bill of sale. The following new and updated forms have been sent to the forms providers. Please note it could take several days for the new forms to populate.