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. Residential Resale Transaction Forms.Affidavit For Land In Unincorporated Areas: Buyers in Arizona must provide a written affidavit when purchasing an unincorporated land contract. How to properly fill out the Arizona Association of Realtors Resale Purchase Contract using Dotloop. 1. Enter buyer's and seller's names. Edit, sign, and share az purchase agreement online. No need to install software, just go to DocHub, and sign up instantly and for free.