If a counter offer is attached, the seller must sign and deliver both the offer set forth in the contract form and the counter offer. A For Sale By Owner contract Arizona must include: 1.The Purchase Price, 2. Listing with a contingency to find a replacement home. This is like saying that your home might be for sale. What form is needed to make a cash offer on a house in arizona. The form for the buyers realtor. This attachment should be given to the Buyer prior to the submission of any offer and is not part of the Residential Resale Real Estate Purchase. In this article, we will talk about the Arizona real estate purchase agreement and mandatory disclosures that sellers must make prior to the sale. An Arizona residential purchase agreement is a legally binding document that outlines the terms and conditions for the sale of residential property.