Use a California business purchase agreement to record the sale of a business. Download your free template today.Business Bill of Sale: This document outlines the sale details, including the purchase price, assets included, and any warranties or guarantees. A Business Sale Agreement sets out the terms of sale clearly, which ensures that both parties interests are protected. Take a look at our sample below. The heart of this journey lies in the Commercial Real. Estate Purchase Agreement, a legally binding document outlining the terms of the transaction between.