Structure on the outside
Fazlur Khan’s design uses the outer walls and their diagonal braces as part of a tube that resists wind and earthquake loads. The X-braces you see from the street are doing structural work.
A city in a tower
The building mixes uses: offices sit below a sky lobby on the 44th floor, with around 700 homes above. The observation deck is on the 94th floor.
A recognised design
In 1999 the building received the American Institute of Architects’ Twenty-five Year Award, given to buildings that have stood the test of time.
