Changes: Buyer shall immediately notify Seller of any changes in the loan program, financing terms, or lender described in the. An Arizona purchase agreement facilitates the sale of real estate for an agreedupon price between the buyer and seller.Use this free customizable owner financing contract template to confirm financing between the owner selling a home and a buyer purchasing it. 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. Purchase and Sale Agreement. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.