A unique application of customizable commercial real estate contract templates, including Purchase and Sale, Lease, and Listing agreements. This Sales Agreement contains the substantive rules for an international sales contract, i.e.Purchase and Sale Agreement. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. This document is a legally binding agreement between a buyer and seller for the purchase and sale of commercial real estate in Arizona. How to Write a Real Estate Purchase Agreement. A commercial purchase agreement is a legal real estate contract that transfers commercial property ownership from a seller to a buyer. A commercial purchase agreement is a legal real estate contract that transfers commercial property ownership from a seller to a buyer. The Arizona Department of Revenue (Department or ADOR) administers the property tax system in cooperation with the 15 county assessors, among others. Balance of purchase price.