Chicago City Hall is the official seat of government of the City of Chicago in Illinois , United States . Adjacent to the Richard J. Daley Center and the James R. Thompson Center , the building that includes Chicago City Hall houses the offices of the mayor , city clerk , and city treasurer ; some city departments ; aldermen of Chicago 's various wards ; and chambers of the Chicago City Council on the west side of the building . The building 's east side ( called County Building ) is devoted to the various offices of Cook County , including chambers for the Cook County Board of Commissioners . Situated on a city block bounded by Randolph , LaSalle , Washington Boulevard , and Clark Street , the 11-story structure was designed by the architectural firm Holabird & Roche in the classical revival style and built to replace and expand an earlier city hall . Its location has served as the center of city government from 1853 to 1871 , and with a break due to the Great Chicago Fire , from 1885 to the present . The current hall was officially dedicated on February 27 , 1911
Great Chicago Fire
Great Chicago Fire
Chicago City Hall