Willis Tower

Willis Tower
Icon based on Facebook page; text from official website
Willis Tower as seen from Lake Michigan in April 2019
Map
Former namesSears Tower (1973–2009)
Record height
Tallest in the world from 1973 to 1998[I]
Preceded byWorld Trade Center
Surpassed byPetronas Towers[4]
General information
StatusCompleted
TypeOffice, observation, communication
Architectural styleInternational
Location233 S. Wacker Drive
Chicago, Illinois 60606
United States
Coordinates41°52′44″N 87°38′09″W / 41.8789°N 87.6358°W / 41.8789; -87.6358
Current tenants
Named forWillis Towers Watson
Sears (1973–2009)
Construction started1970; 54 years ago (1970)
Completed1974; 50 years ago (1974)
OpeningSeptember 1973; 51 years ago (September 1973)
OwnerBlackstone Group[2]
Height
Architectural1,451 ft (442 m)[1]
Tip1,729 ft (527 m)[1]
Top floor1,354 ft (413 m)[1]
Technical details
Floor count110 (+3 basement floors)[3]
Floor area4,477,800 sq ft (416,000 m2)[1]
Lifts/elevators104,[1] with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group and recently modernized by Otis Elevator Company
Design and construction
Architect(s)Skidmore, Owings & Merrill[1]
Fazlur Rahman Khan
Bruce Graham
EngineerJaros, Baum & Bolles (MEP), Aon Fire Protection Engineering, formerly Schirmer Engineering Corporation (Fire)[1]
Structural engineerSkidmore, Owings & Merrill
Main contractorMorse Diesel International
References
I. ^ "Willis Tower". Emporis. Archived from the original on September 23, 2015.{{cite web}}: CS1 maint: unfit URL (link)
[1]

The Willis Tower, originally and still commonly referred to as the Sears Tower, is a 110-story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest building, a title that it held for nearly 25 years. It is the third-tallest building in the Western Hemisphere, as well as the 23rd-tallest in the world. Each year, more than 1.7 million people visit the Skydeck observation deck, the highest in the United States, making it one of Chicago's most popular tourist destinations.[5]

The building occupies a site bounded by Franklin Street, Jackson Boulevard, Wacker Drive, and Adams Street. Graham and Khan designed the building as nine square "tubes", clustered in a 3×3 matrix; seven of the tubes set back at upper floors. The tower has 108 stories as counted by standard methods, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110.[1][3] The facade is made of anodized aluminum and black glass. The base of the building contains a retail complex known as the Catalog. The lower half of the tower was originally occupied by retail company Sears, which had its headquarters there until 1994, while the upper stories were rented out.

The structure was known as the Sears Tower from its construction until the naming rights were included in a 2009 lease with the Willis Group. Local area residents still refer to the building by its old name.[6] As of April 2018, the building's largest tenant is United Airlines, which occupies around 20 floors.[7][8][9] Other major tenants include the building's namesake Willis Towers Watson, and law firms Schiff Hardin and Seyfarth Shaw.[9] Morgan Stanley became the building's fourth-largest tenant in 2017.[9][10]

  1. ^ a b c d e f g h i "Willis Tower – The Skyscraper Center". Council on Tall Buildings and Urban Habitat. June 13, 2015. Archived from the original on December 23, 2019. Retrieved June 13, 2015.
  2. ^ de la Merced, Michael J. (March 16, 2014). "Blackstone Group Purchases Landmark Willis Tower in Chicago". The New York Times. Retrieved August 11, 2015.
  3. ^ a b "History and Facts - Willis Tower". willistower.com.
  4. ^ Disputed due to the fact that the Willis/Sears Tower is taller than the Petronas Towers by tip height, roof height, & highest occupied floor."Petronas vs. Sears Tower Controversy". Retrieved February 24, 2024.
  5. ^ "Willis Tower owner seeks thousands of new visitors per day, as $500 million expansion takes shape". Chicago Tribune. September 13, 2018. Retrieved October 19, 2022.
  6. ^ McClelland, Edward (June 5, 2019). "Chicagoans Refuse to Call These Places by Their Real Names". Chicago Magazine. Retrieved May 19, 2021.
  7. ^ [1] Archived August 15, 2012, at the Wayback Machine
  8. ^ Snyder, Brett (December 16, 2013). "A Day with United Management: Elite Status, Mileage Devaluation, and Increasing Change Fees". The Cranky Flier. Retrieved December 18, 2013.
  9. ^ a b c Ecker, Danny (April 16, 2018). "Morgan Stanley moving second office to Willis Tower". Crain's Chicago Business. Retrieved October 3, 2018.
  10. ^ "20 years after 9/11, a new crisis looms for Willis Tower". Crain's Chicago Business. September 1, 2021. Retrieved January 25, 2022.