Arizona Residential Purchase Contract is a legal document that outlines the duties, requirements, and other information when buying a house in Arizona. A) Offers are typically written on an Arizona State approved Purchase Contract, which is 9 pages long!1. Enter buyer's and seller's names. A For Sale By Owner contract Arizona must include: 1. The Purchase Price, 2. This particular contract dictates the purchase and sale of real estate in Phoenix and throughout the state. Here are three key elements to consider for any purchase agreement. 1) Basic Terms Who's selling the property?