That would be the Dirksen Courthouse and Federal Plaza https://www.gsa.gov/historic-buildings/everett-m-dirksen-us-courthouse-chicago-il https://www.gsa.gov/hi

That would be the Dirksen Courthouse and Federal Plaza https://www.gsa.gov/historic-buildings/everett-m-dirksen-us-courthouse-chicago-il https://www.gsa.gov/historic-buildings/everett-m-dirksen-us-... You can see right through it: https://www.google.com/maps/@41.8784431,-87.6293035,3a,37.5y,99.53h,93.29t/data=!3m6!1e1!3m4!1sYJZJ0HcQRSvC-uQObzmvGw!2e0!7i16384!8i8192 https://www.google.com/maps/@41.8784431,-87.6293035,3a,37.5y... The real gem of the Federal Plaza is actually the post office building. When you walk inside you have the feeling of a floating ceiling with no columns (there are well-hidden columns).