Sell Agreement (BSA) is a lifetime contract providing for the transfer of a business interest upon the occurrence of one or more triggering events. Virginia transaction attorney shares how to write an effective and legally binding business purchase agreement.A skilled Virginia business and tax attorney can draft a buy-sell agreement that best meets your current and future needs. 1. Sale of Property. As a buyer, you need to know the terms of existing contracts and which contracts you will be responsible for fulfilling once the business sale is complete. Under Virginia law, the sale of goods is codified in great detail in the Virginia Code, directly resulting from Virginia's adoption of the UCC.