65 ILCS 5/11-71-12
In addition to the other powers granted under this Division 71, the corporate authorities of any municipality may, by ordinance, provide for the issuance of its general obligation bonds for the purpose of acquiring, constructing, equipping, and improving motor vehicle parking lots or garages constructed on, above or below ground level or at all such levels, public off-street parking facilities for motor vehicles and other parking facilities necessary or incidental to the regulation, control and parking of motor vehicles. Such facilities may be constructed or located in other public buildings or structures. Such bonds may be used to finance in whole or in part such improvements.
Bonds issued pursuant to this Section must be payable within 20 years and the interest on such bonds may not exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract. The interest may be made payable at such times (annually or semi-annually) as the ordinance prescribes. Before or at the time of issuance of bonds under this Section, the corporate authorities of the municipality shall provide, by ordinance, for the levy and collection of a direct annual tax upon all the taxable property within the municipality in an amount sufficient to meet the principal and interest of the bonds as they mature, which tax shall be in addition to that otherwise authorized to be levied and collected for corporate purposes. The corporate authorities of the municipality, in determining the costs of such improvements, may include the estimated costs of issuance of such bonds, engineering, inspection, fiscal and legal expenses, and interest which it estimates will accrue during construction period and for 6 months thereafter on money that is borrowed or money that is estimated will be borrowed.
No bonds may be issued or tax levied under this Section until the question whether such bonds should be issued and such tax levied has been certified by the municipal clerk and submitted to the qualified electors of the municipality at an election in accordance with the general election law and unless a majority of those voting on the proposition approve the issuance of bonds and levy of tax. When providing by ordinance for the bond issue and tax levy, the corporate authorities of the municipality shall also order the submission of the question to the electors.
If the proposition for issuance of bonds under this Section has been approved, such bonds shall be issued in accordance with Division 4 of Article 8 of this Act.
With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.
65 ILCS 5/11-71-12