Massachusetts business lawyers explain how asset purchase agreements work and what they should include. We represent buyers and sellers in asset purchase transactions in Essex County, Massachusetts, and in Rockingham County, New Hampshire.Section C - Lease purchase financing agreements. An asset purchase agreement is a written legal instrument that formalizes the purchase of a business or significant business asset. 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.