- 344-metre John Hancock Observatory by
US firm Skidmore Owings & Merrill, home to offices and restaurants (+ observatory), as well as about 700 condominiums.
- 442-metre Willis Tower (also by Skidmore Owings & Merrill) - more commonly known as the Sears Tower and until recently the tallest building in the US, function as office, observation (Skydeck) and communication tower.
- 423-metre hotel and apartment block (designed by architect Adrian Smith of Skidmore, Owings and Merrill) owned by billionaire real estate developer Donald Trump.
- 177-metre designed by Sheldon Schlegman of A. Epstein and Sons, has 41 floors of tenant space and the two spires at the top cover the main roof and HVAC equipment.
- 179-metre mixed-use residential/commercial building complex by architect Bertrand Goldberg, being the first building in the United States to be constructed with tower cranes.
source from dezeen and wikipedia. check out more of Al Boardman works.
