Notes: This remarkable 108-story, 442 m (1,450 feet) skyscraper stands tall in the s:"Chicago skyline". When completed in 1974 it was the tallest building in the world. It remained the world's tallest building to 1998. It is now the tallest building in the United States and the fourth-tallest free standing structure in the world.

Location: 233 S. Wacker Drive, s:"Chicago", s:"Illinois" 60606
Constructed: 1970-1973
Use: Office, observation, communication
Height: Antenna/Spire 527 m (1,730 feet)
Roof: 442 m (1,451 ft )
Floors: 108
Floor area: 418,064 m (353,961 m rentable), 4.56 million sq ft. (3.81 million sq ft. rentable)
Elevators: 104, with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group Companies
Architect: Skidmore, Owings and Merrill