Use a California business purchase agreement to record the sale of a business. Download your free template today.A Business Purchase Agreement is entered into between a seller and purchaser for rights to the business. A business purchase agreement is a legal contract specifying terms for buying or selling a business, including conditions and obligations. This Agreement for Purchase and Sale of Real Property and Escrow. Simantob Law Group's business purchase and sale attorneys have the expertise and track record to assist business purchasers and sellers. The easiest way to create a Business Purchase Agreement is to use a template that is customized to your state. A legal contract exists only when one party makes an offer and the other accepts all terms of that offer. A unique application of customizable commercial real estate contract templates, including Purchase and Sale, Lease, and Listing agreements. A selling agreement letter is used to keep a record of a sale of personal property.