Ariz. Rev. Stat. § 47-9501 – Filing office

A. Except as otherwise provided in subsection B, if the local law of this state governs perfection of a security interest or agricultural lien, the office in which to file a financing statement to perfect the security interest or agricultural lien is:
1. 1. The office designated for the filing or recording of a record of a mortgage on the related real property, if:
  1. (a) The collateral is as-extracted collateral or timber to be cut; or
  2. (b) The financing statement is filed as a fixture filing and the collateral is goods that are or are to become fixtures; or
2. 2. The office of the secretary of state, in all other cases, including a case in which the collateral is goods that are or are to become fixtures and the financing statement is not filed as a fixture filing.
B. The office in which to file a financing statement to perfect a security interest in collateral, including fixtures, of a transmitting utility is the office of the secretary of state. The financing statement also constitutes a fixture filing as to the collateral indicated in the financing statement that is or is to become fixtures.