Ariz. Rev. Stat. § 12-781
A. A property owner, tenant, public or private employer or business entity shall not establish, maintain or enforce a policy or rule that prohibits a person from lawfully transporting or lawfully storing any firearm that is both:
C. This section does not apply if:
3. The property owner, tenant, public or private employer or business entity provides a parking lot, parking garage or other area designated for parking motor vehicles, that: