A simple For Sale By Owner contract in Arizona must mention the purchase price, down payment, and closing date. 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.BUYER agrees to purchase and SELLER agrees to sell the real property, and the improvements thereon, commonly known as: , in the County of. An Arizona purchase agreement facilitates the sale of real estate for an agreedupon price between the buyer and seller. An Arizona real estate purchase agreement is a legally binding contract used in the sale or purchase of property. Curious about the paperwork for selling a house without a Realtor? In this article, we will talk about the Arizona real estate purchase agreement and mandatory disclosures that sellers must make prior to the sale. First, include the property address as well as its legal description (found on the deed). Then go into detail about what is included or excluded from the sale. Outline and agree upon the terms of a sale.