70 ILCS 1510/13

No holder of any bonds issued under the Project Sections has the right to compel any exercise of taxing power of the Chicago Park District to pay the bonds or the interest thereon, and the bonds do not constitute an indebtedness of the Chicago Park District or a loan of credit thereof within the meaning of any constitutional or statutory provision. It shall be plainly stated on the face of each bond that it has been issued under the provisions of the Project Sections and that it does not constitute an indebtedness of the Chicago Park District or a loan of credit thereof within the meaning of any constitutional or statutory provision.