110 ILCS 420/6
Any holder of a bond, or of any of the coupons of any such bonds, issued under this Act, may, by action, mandamus, injunction or other proceeding enforce and compel the performance of all duties required by this Act, including establishment of sufficient fees or charges for use of any such building or buildings and the application of the income and revenue thereof, and it shall be the duty of the Board of Trustees upon the issuance of any such bonds, to establish by resolution from time to time the fees or charges to be made for the use of any such building or buildings, which fees or charges shall be adjusted from time to time in order to always provide sufficient income for maintenance and operation and payment of the principal of and interest on such bonds issued as provided for in this Act.
110 ILCS 420/6