1. Title the Document: Start with a clear and descriptive title such as "Business Bill of Sale" or "Business Sale Agreement." View the forms library.The Agreement of Sale for Commercial Real Estate should be used to outline the terms of the agreement when selling or purchasing a commercial property. Seller has executed and delivered the Deed and other documents necessary for issuance of title policy to Buyer. â–«. Seller has marketable title. A business purchase agreement should detail the names of the buyer and seller at the start of the contract. 1. Sale and Purchase.