Willis Tower

Willis Tower
ArchitectSkidmore, Owings & Merrill
Architectural Height1,450 ft (442 m)
Total Floor110, with 16Lifts
Floor area4,477,800 sq ft (416,000 m sq)
Address233 S Wacker Drive, Chicago,
IL 60606, United States
CountryUnited States
Construction started1970
OpenedJune 22, 1974
CostUSD $150 million
OwnerBlackstone Group
Social MediaInstagram

Willis Tower is 110 Story skyscraper in the United States at 233 S Wacker Drive, Chicago. It is designed by Skidmore, Owings, and Merrill and their team of Colombian- Peruvian architect Bruce Graham and structural engineer Fazlur Rahman Khan. The construction started in 1970 and was completed in 1973. Willis Tower construction cost was USD $150 Million. It opened for people on June 22, 1974. Currently, it is owned by Blackstone Group.

Willis Tower
Wills Tower Construction


Tallest BuildingRank
United States3rd

More Facts about Willis Tower

  • Its previous name was Sears Tower but on July 16, 2009, the building was officially renamed as Willis Tower.
  • 2,000 construction workers took part in building Willis Tower.
  • It has been the tallest building in the world from 1973 to 1998.
  • Willis Tower is the 12th tallest building in the world and it is the second tallest building in North America.
  • Willis Tower was purchased by Blackstone in 2015 for $1.3 billion.
  • Wills tower has an observation deck, called the sky deck. It becomes a tourist attraction from June 22, 1974.
  • Each year more than one million people visit the sky deck.
  • Willis Tower has approximately 16,100 bronze-tinted windows and 76,000 tons of steel.
  • The design of this building was inspired by an advertisement for a package of cigarettes.
  • There are many broadcast station transmitters which are located at the top of the tower.
  • The building has been shown in a number of movies and television shows which are set in Chicago.
willis tower lightning


  • Skydeck opened in 1974 and attracts more than 1.7 million visitors annually and it is the highest observation deck in the United States.
  • The Ledge is made of three layers of half-inch thick glass laminated into one seamless unit.
  • The ledge is 1,353 feet and 103 stories up.


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