If the property owner has changed the mailing address, moved, sold, or closed the business, they must complete form APP149 Request for Change on our website. We can help you prepare various needed documents to close the sale such as an Asset Sales Agreement, Entity Sale Agreement, Promissory Note, Security Agreement.The documents you need to buy or sell a business depend on the structure (discussed here) and complexity of the deal as well as its specific terms. A business usually has many assets. How to Register a Fictitious Business Name. Our business law attorney in San Bernardino provides legal assistance to startups, business owners, partners, and shareholders. In an asset sale, the new owner purchases the business's physical assets. The seller retains all rights to the legal entity.