70 ILCS 520/7.1
Any unit of local government which is authorized to issue, sell and deliver its local government securities under any provision of the Illinois Constitution or laws of this State may issue, sell, and deliver such local government securities to the Authority as provided by this Act, provided that and notwithstanding any other provision of law to the contrary, any such unit of local government may issue and sell any such local government security at any interest rate, which rate or rates may be established by an index or formula which may be implemented by persons appointed or retained therefor, payable at such time or times and at such price or prices to which the unit of local government and the Authority may agree. Any unit of local government may pay any amount charged by the Authority. Any unit of local government may pay out of the proceeds of its local government securities or out of any other moneys or funds available to it for such purposes any costs, fees, interest deemed necessary, premiums or revenues incurred or required for financing or refinancing this program, including without limitation any fees charged by the Authority and its share, as determined by the Authority, of any costs, fees, interest deemed necessary, premiums or revenues incurred or required pursuant to this Act. All local government securities purchased by the Authority pursuant to this Act shall upon delivery to the Authority be accompanied by an approving opinion of bond counsel as to the validity of such securities. The Authority shall have discretion to purchase or otherwise acquire those local government securities as it shall deem to be in the best interest of its financing program for all units of local government taken as a whole.
70 ILCS 520/7.1