A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. The preparation and negotiation of the purchase agreement is where the specifics of the transaction are worked out.How to Write a Real Estate Purchase Agreement. CONTRACT OF SALE – OFFICE, COMMERCIAL AND MULTI-FAMILY RESIDENTIAL. PREMISES. We've prepared a comprehensive, straightforward guide to understanding the pivotal role of earnest money in a successful CRE property sale in the US. This document summarizes a real estate listing agreement between a seller and brokerage agency in Michigan. A commercial purchase agreement is a legal real estate contract that transfers commercial property ownership from a seller to a buyer. It benefits the buyer and the seller and acts as a legally binding agreement.