Once completed, note the SST number and come into our office to finish the process. This Asset Purchase Agreement (the Agreement ) is made as of the 22nd day of February,.Real Estate File No: 4026-57.3. Buying or selling a business? Answer a few simple questions to create your own Business Purchase Agreement. An asset purchase agreement is a legal document that outlines the terms and conditions of buying or selling assets in a business transaction. "Business Day" means a day other than a Saturday, Sunday or a day on which banks are legally closed for business in the State of California.