City Hall-County Building - View this location on map Since 1853, the governments of Chicago and Cook County have shared three different buildings on this site. The monumental, Classical Revival-style exterior of the present structure, which was designed to be a functional and efficient office building, symbolizes the strength, dignity, and vigor of the governmental functions it contains. The County Building was completed in 1908; City Hall was finished in 1911. 121 N. LaSalle St.., Chicago , IL Historical

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