MA FSBO Real Estate Forms. Get to know the various forms and pieces of paperwork that you will need to use during your FSBO transaction.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. This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly. A Massachusetts purchase agreement is the standard legal form for selling or purchasing a home. It documents the transaction's stipulations. Forms are state specific because real estate laws vary significantly from state to state.