The transactional attorneys at Hendershot Cowart PC have valuable experience guiding business owners and investors through the purchase or sale of a business. At the Closing and subject to the terms and conditions of this Agreement,This article discusses the elements of buying or selling a small business in Texas, whether the business is focused on real estate or otherwise. Before an offering or sale of a business opportunity in. Texas, the principal seller must register the business opportunity with the secretary of state. Tex. 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.