Past Locations
610 South Michigan Avenue, 1918–1924
410 North Michigan Avenue, Wrigley Building North Tower, 1924–1936
400 North Michigan Avenue, Wrigley Building South Tower, 1936–1947
109 East Ontario Street, 1951–1995
222 West Superior Street, 1995–1997
Current Location
201 East Ontario Street, 1997–present