55 ILCS 5/5-34005
Whenever any Expressway bonds are called for payment and paid as provided in Section 5-34004, the taxes thereafter to be extended for payment of the principal of and interest on the remainder of the issue shall be reduced in an amount equal to the principal of and interest that would have thereafter accrued upon the Expressway bonds so called for payment and paid. A resolution or resolutions shall be adopted by the Board of Commissioners finding these facts and a certified copy or copies thereof shall be filed with the County Clerk and with the Directors of the Department of Central Management Services and the Department of Transportation. The County Clerk shall thereupon reduce and extend such tax levies in accordance with said resolution or resolutions. To the extent that moneys from the State of Illinois have actually been paid into the Expressway bond and interest sinking fund account or accounts required to be created by Section 5-34006, the taxes next to be extended for payment of principal of and interest on said bonds shall be abated, or reduced, as the case may be. Prior to the extension of each year's taxes, the Board of Commissioners of such county shall adopt a resolution or resolutions finding such facts and shall file a certified copy or copies thereof with the County Clerk. Thereupon the County Clerk shall abate or reduce, as the case may be, and extend such tax levies in accordance therewith.
55 ILCS 5/5-34005