Massachusetts Business Lawyer Logo. A Massachusetts commercial real estate purchase and sale agreement is a contract between a buyer and seller of land to be used for business purposes.The MAR Standard Form Purchase and Sale Agreement is designed to protect the interests of both the buyer and the seller in a property transaction. Business Bill of Sale: This document outlines the sale details, including the purchase price, assets included, and any warranties or guarantees. Discover how a real estate attorney can revise a standard Massachusetts Purchase and Sale Agreement to better protect both home buyers and sellers.