Appraisal districts are only supposed to be in the business of appraising land and improvements. They have no business (pun intended) assessing the value of a business. If they try to raise your taxes to the purchase price you need to fight that using comparable land sales and reasonable valuations for improvements (infrastructure, POH, etc) to bring that value down. You are not supposed to get taxed on the value of goodwill and other business items.
Some contracts spell out estimated land vs improvements vs goodwill value as part of the Purchase Price to help the conversation. Speak with your accountant and real estate attorney if you think you need more CYA.