Seller desires to sell and Buyer desires to purchase certain assets of Seller used in the Business in accordance with the terms and conditions contained herein. An asset purchase agreement (APA) is a legally binding document that details the terms and conditions related to the purchase and sale of a company's assets.Whether you are a business buyer or seller, contact San Diego Corporate Law for a consultation to discuss your business sale options. Asset Purchase Agreements (APAs) are essential documents for asset sales, but they're far more complex than a simple transaction. An asset purchase agreement is a written legal instrument that formalizes the purchase of a business or significant business asset.