Use a commercial real estate purchase agreement to secure transactions and protect your interests effectively. An attorney's explanation of an Office Purchase and Sales Agreement and its free template for commercial real estate.In this video, Ron Rhode will be going over the A.CRE Office Purchase and Sales Agreement free real estate template. A commercial real estate purchase agreement is a legal document between a buyer seeking to purchase commercial property from a seller for an agreed-upon price. The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. Schedule A. Description of premises (to be attached). 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.