Willis tower tour
Completed in 1974, this 110-storey tower was designed by Skidmore, Owings & Merrill – the practice where my flatmate currently works. He let me sneak into a building tour for the current interns on Friday morning, and we were shown the service floors that divide the building into five independently serviced sections. Plus, we were let onto the roof!
Bob explaining some of the technology in the building.
Colour-coded service ducts - an M&E engineer's dream. Fireproofing to the steel structure appears Gaudí-esque.
The last cut-off still sits in this die, which was used to fabricate replacement window frames until 1972.
Out on one of the roofs. Note the massive window-washing platform parked on its perimeter tracking.