By contrast, Massachusetts does not require sellers to provide a disclosure form or statement to potential buyers. Massachusetts requires those selling FSBO to fill out and file many documents and forms.Several of these documents are legally binding agreements. 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. Learn how to file for paternity, child custody or parenting time, what forms you'll need, and where to file. Selling your home FSBO? Massachusetts law about real estate. Laws, regulations, cases, and web sources on real estate law in general. A For Sale By Owner contract Massachusetts must include: 1. The Purchase Price, 2.