Need help selling or buying a business? Romano Law's team provides buyer due diligence, contract negotiation, seller preparation, closing assistance, more.Use a California business purchase agreement to record the sale of a business. Download your free template today. Draft and Sign the Purchase Agreement. Stage 4: Drafting a Purchase Agreement for the Sale. A purchase agreement is the primary legal document used for the acquisition of a business. The contract will state the date at which the final transfer of ownership and possession of the business will occur, and when the seller will get the money. This article discusses seven (7) types of seller liabilities that should concern a buyer when negotiating the purchase of a California business. Many Buyers will require that a sale be structured as an Asset Purchase in order to avoid responsibility for prior liabilities or expenses of the business.