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. How to properly fill out the Arizona Association of Realtors Resale Purchase Contract using Dotloop.Residential Resale Transaction Forms. 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. A For Sale By Owner contract Arizona must include: 1. The Purchase Price, 2.