Whether you are a business buyer or seller, contact San Diego Corporate Law for a consultation to discuss your business sale options. A Purchase and Sale Agreement for a Business sets out the final transaction between a buyer and a seller of a business.It is generally fairly detailed. Find business purchase agreement lawyers for San Diego, CA to hire. No cost to post a project to get multiple bids in hours to compare before hiring. Our Boyd Law San Diego business purchase and sale lawyers have many years of combined successful experience practicing law in California. All parties must negotiate and agree on the purchase agreement. A business purchase agreement is a legal contract specifying terms for buying or selling a business, including conditions and obligations.