Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer. A sample asset purchase agreement is a legal document outlining the provisions overseeing the sale and purchase of specific assets between two parties.An APA not only describes the assets to be purchased but also important details like price, warranties, and breach of contract. A business sale agreement is a legal document that describes and records the price and other details when a business owner sells the business.