You are legally bound to honor the agreement. In Arizona, we have a special form called a Pre-Qualification Form.An Arizona residential purchase agreement is a legal document outlining the terms and conditions for a buyer's purchase of residential property from a seller. Theoretically, you could write an offer on a restaurant napkin but nearly all Arizona home purchase offers are written on pre-made contract forms. Once you've found the home you wish to purchase, I'll guide you through making an effective offer based on property and market conditions. This attachment should be given to the Buyer prior to the submission of any offer and is not part of the Residential Resale Real Estate Purchase. First time home buyer: Writing a Home-Offer Letter – Is It a Good Idea? Specify the purchase price and payment terms. If the final price is contingent upon due diligence, make that clear. The Arizona Real Estate Purchase Agreement form serves as a key document in the process of buying or selling residential real estate in the state.