Ariz. Rev. Stat. § 48-574
D. The governing body shall make annual statements and estimates of the expenses of the district, which shall be provided for either:
J. If, in the opinion of the governing body, territory adjacent to a district formed under this section would benefit from being a part of the district, the governing body, by resolution, may include the territory in the district formed under this section if the following conditions are met:
N. For the purposes of this subsection, a property owner is an owner of real property, exclusive of mortgagees and other lienholders, that is within an improvement district that was formed as prescribed by this section. A property owner may petition the governing body to dissolve the district pursuant to the following procedures: