COM §9501: (a) Except as otherwise provided in subdivision (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

(a) Except as otherwise provided in subdivision (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 either of the following: (1) The office designated for the filing or recording of a record of a mortgage on the related real property, if either of the following conditions is satisfied: (A) The collateral is as-extracted collateral or timber to be cut. (B) The financing statement is filed as a fixture filing and the collateral is goods that are or are to become fixtures. (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 which is or is to become fixtures.