In counties with 3,000,000 or more inhabitants, the assessments of property after review by the board of appeals (until the first Monday in December 1998 and the board of review beginning the first Monday in December 1998 and thereafter) shall be certified to the county clerk and shall be the basis of that clerk's reports of assessments to the Department and, as equalized, shall be used by the county clerk in ascertaining tax rates and extending taxes.
35 ILCS 200/16-155