70 ILCS 1205/9.2-1
Any park district has the power, subject to the limitations of Sections 9.2-1 through 9.2-6 of this Article to acquire, construct and operate indoor or outdoor tennis courts, handball, racquetball, or squash courts, or zoos and other necessary facilities pertinent thereto, and extend or improve such courts or zoos and facilities, borrow money and as evidence thereof to issue its bonds, payable solely from the revenue derived from the operation of such indoor or outdoor tennis courts, handball, racquetball, or squash courts, or zoos and facilities. These bonds may be issued in such amounts as may be necessary to provide sufficient funds to pay all the costs of the acquisition or construction, or extension or improvement of indoor or outdoor tennis courts, handball, racquetball, or squash courts, or zoos and facilities, including engineering, legal and other expenses, together with interest on the bonds to a date 6 months subsequent to the estimated date of the completion. The bonds are negotiable instruments and shall be executed by the president and secretary of the district and countersigned by the treasurer.
70 ILCS 1205/9.2-1