Chicago City Hall stands at the end of Richard J. Daley Plaza in Chicago on March 31, 2011. The building houses the government offices of the City of Chicago as well as many offices of Cook County government. UPI/Brian Kersey

Chicago City Hall stands at the end of Richard J. Daley Plaza in Chicago on March 31, 2011. The building houses the government offices of the City of Chicago as well as many offices of Cook County government. UPI/Brian Kersey

Chicago City Hall stands at the end of Richard J. Daley Plaza in Chicago on March 31, 2011. The building houses the government offices of the City of Chicago as well as many offices of Cook County government. UPI/Brian Kersey