Section 9-501 - Filing Office(a) Filing offices. Except as otherwise provided in subsection (b), if the 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) the office designated for the filing or recording of a record of a mortgage on the related real property, if: (A) the collateral is as-extracted collateral or timber to be cut; or(B) the financing statement is filed as a fixture filing and the collateral is goods that are or are to become fixtures; or(C) the collateral is a cooperative interest; or(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) Filing office for transmitting utilities. 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.(c) The term "filing officer" or "recording officer" means the county clerk of the county, except in the counties of Bronx, Kings, New York, and Queens where it means the city register in the county; and the term "filing officer" includes the secretary of state where a filing is made in the department of state.