Ariz. Rev. Stat. § 36-1474
A. Every municipality shall have all the powers necessary or convenient to carry out and effectuate the purposes and provisions of this article, including the following powers in addition to others granted by this article:
3. Within its area of operation:
(h) To enter into any contracts necessary to effectuate the purposes of this article.
No statutory provision with respect to the acquisition, clearance or disposition of property by public bodies shall restrict a municipality in these functions with respect to a redevelopment project, unless the legislature specifically so states.