The document contains everything from the agreed-upon purchase price to the legal description of the land as it appears on the deed. The purchase and sale agreement deals with the title to the property and the deed.Here's a video of Tom Truong helping out an agent fill out Offer to Contract to Purchase. Discover how a real estate attorney can revise a standard Massachusetts Purchase and Sale Agreement to better protect both home buyers and sellers. Customize the agreement: Fill in the template with specific details of the transaction.