A deed of trust is a real estate security document. In this article, we break down the fundamental requirements and procedures for executing a Deed of Trust in Arizona.A Deed of Trust is a real estate security document. Unlike a mortgage which only involves a borrower and a lender, these documents have three parties. The Maricopa County Recorder's Office processes and preserves deeds, plats, and a variety of other important documents. The Deed of Trust is the primary security document used in Arizona. There are many similarities between the Deed of Trust and the Mortgage. Loaning in Deeds of Trust is a great way to obtain a constant secured return on your money. A lender on real estate has the option of using a Deed of Trust to secure the loan. Deeds of Trust were first adopted in Arizona in 1971.