A BuySell agreement can help all business partners determine what will happen in case of certain circumstances. An asset purchase agreement is one type of contract, and way, to purchase or sell a business.Due Diligence in the Sale of a Business for the Seller C. The Sales Agreement for the Sale of a Business in Phoenix or Arizona. I. Buying a Business in Arizona Hudspeth P.C. can help. Our Phoenix business attorneys draft reliable buy-sell agreements for companies throughout Arizona. A business purchase agreement is a legal contract specifying terms for buying or selling a business, including conditions and obligations. Buy-sell agreements are legal contracts that outline how a departing owner can exit the business and what happens to their stake in the company. How to properly fill out the Arizona Association of Realtors Resale Purchase Contract using Dotloop.