315 ILCS 30/28.1
Any municipality which as of January 1, 1970, has authorized the issuance and sale of bonds by referendum pursuant to Section 28, but has not sold bonds so authorized, may, until January 1, 1972, issue such bonds at a rate of interest not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, without a further referendum, upon the adoption of an ordinance authorizing a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, provided by this Section. Such bonds shall be otherwise subject to the provisions of Section 28. Bonds may be so issued only up to the amount authorized by the referendum and not previously sold. This Section does not affect any bonds previously issued and sold under Section 28. If the provisions of this Section are held invalid, such invalidity does not affect the provisions of Section 28 which shall remain in full force and effect as if this Section had not become law, and to this end the provisions of this Section are severable from the provisions of Section 28.
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.
315 ILCS 30/28.1