The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. Significantly, a buy-sell agreement often establishes a formula for determining the sale price of the business and its components.A Business Purchase Agreement is a contract that transfers a business entity from its owner to a new buyer. Asset Purchase Agreements (APA). Identify the parties involved in the transaction. 2. Nathanson Law Firm is dedicated to providing our clients with legal services in Real Estate and Business Law cases.