CocoSign provides a free Massachusetts purchase and sale agreement template that you can download, edit, and use. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.This fill-in-the-blank form can be used to change or extend inspection, signing, financing or other dates contained in a signed real estate contract. How do I fill this out? Parties: the "SELLER," agrees to sell and. , the "BUYER," agrees to buy, the premises described in paragraph 2 on the terms set forth below. Are you looking for a loan agreement form in Massachusetts? Download our free Massachusetts Loan Agreement Form which is available as PDF or Word documents. Step 1 – Fill Out the Buyer and Seller Information. 1. Seller. Write down the seller's full name.