| Willis Tower | |
|---|---|
Willis Tower as seen from
Lake Michigan in April 2019
|
|
 |
|
| Former names | Sears Tower (1973–2009) |
| Record height | |
| Tallest in the world from 1973 to 1998[I] | |
| Preceded by | World Trade Center |
| Surpassed by | Petronas Towers[4] |
| General information | |
| Status | Completed |
| Type | Office, observation, communication |
| Architectural style | International |
| Location | 233 S. Wacker Drive Chicago, Illinois 60606 United States |
| Coordinates | 41°52′44″N 87°38′09″W / 41.8789°N 87.6358°W / 41.8789; -87.6358 |
| Current tenants | |
| Named for | Willis Towers Watson Sears (1973–2009) |
| Construction started | 1970; 54 years ago (1970) |
| Completed | 1974; 50 years ago (1974) |
| Opening | September 1973; 50 years ago (September 1973) |
| Owner | Blackstone Group[2] |
| Height | |
| Architectural | 1,451 ft (442 m)[1] |
| Tip | 1,729 ft (527 m)[1] |
| Top floor | 1,354 ft (413 m)[1] |
| Technical details | |
| Floor count | 110 (+3 basement floors)[3] |
| Floor area | 4,477,800 sq ft (416,000 m2)[1] |
| Lifts/elevators | 104,[1] with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group and recently remodernized by Otis Elevator Company |
| Design and construction | |
| Architect(s) | Skidmore, Owings & Merrill[1] Fazlur Rahman Khan Bruce Graham |
| Engineer | Jaros, Baum & Bolles (MEP), Aon Fire Protection Engineering, formerly Schirmer Engineering Corporation (Fire)[1] |
| Structural engineer | Skidmore, Owings & Merrill |
| Main contractor | Morse Diesel International |
| References | |
| I. ^ "Willis Tower". Emporis. Archived from the original on September 23, 2015. [1] |
|
| Willis Tower | |
|---|---|
|
Willis Tower as seen from
Lake Michigan in April 2019
|
|
|
|
| Former names | Sears Tower (1973–2009) |
| Record height | |
| Tallest in the world from 1973 to 1998[I] | |
| Preceded by | World Trade Center |
| Surpassed by | Petronas Towers[4] |
| General information | |
| Status | Completed |
| Type | Office, observation, communication |
| Architectural style | International |
| Location | 233 S. Wacker Drive Chicago, Illinois 60606 United States |
| Coordinates | 41°52′44″N 87°38′09″W / 41.8789°N 87.6358°W / 41.8789; -87.6358 |
| Current tenants | |
| Named for | Willis Towers Watson Sears (1973–2009) |
| Construction started | 1970; 54 years ago (1970) |
| Completed | 1974; 50 years ago (1974) |
| Opening | September 1973; 50 years ago (September 1973) |
| Owner | Blackstone Group[2] |
| Height | |
| Architectural | 1,451 ft (442 m)[1] |
| Tip | 1,729 ft (527 m)[1] |
| Top floor | 1,354 ft (413 m)[1] |
| Technical details | |
| Floor count | 110 (+3 basement floors)[3] |
| Floor area | 4,477,800 sq ft (416,000 m2)[1] |
| Lifts/elevators | 104,[1] with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group and recently remodernized by Otis Elevator Company |
| Design and construction | |
| Architect(s) | Skidmore, Owings & Merrill[1] Fazlur Rahman Khan Bruce Graham |
| Engineer | Jaros, Baum & Bolles (MEP), Aon Fire Protection Engineering, formerly Schirmer Engineering Corporation (Fire)[1] |
| Structural engineer | Skidmore, Owings & Merrill |
| Main contractor | Morse Diesel International |
| References | |
| I. ^ "Willis Tower". Emporis. Archived from the original on September 23, 2015. [1] |
|
