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.