![]() ![]() Until July 16, 2009, the building was called Sears Tower. Visibility from the Skydeck is approximately 40-50 miles (65-80 kilometers). On a clear day, you can see four states: Illinois, Indiana, Wisconsin and Michigan. More than one million people visit the Skydeck each year, making it one of Chicago’s most popular tourist destinations. Located on the 103rd floor of the tower, it is 1,353 feet (412 meters) high. The Willis Tower observation deck, called the Skydeck, opened on June 22, 1974. The Willis Tower elevators operate as fast as 1,600 feet (488 meters) per minute – among the fastest in the world. The Willis Tower has 104 elevator with 16 double-decker elevator The Willis Tower has approximately 1 6,100 bronze-tinted windows. Within the building, there are 40 kilometers (25 miles) of plumbing, 2,400 kilometers (1,500 miles) of electric wiring, 130 kilometers (80 miles) of elevator cable, and 145,000 light fixtures. The construction cost about US$150 million at the time, equivalent to US$800 million in 2016. Two (the northwest and southeast tubes) ascend to the building’s 50th story two (northeast and southwest) to its 66th three (north, south, and east) to its 90th and two (west and center) to the Sears Tower’s peak on the 108th story. The “tubes” share a uniform width, measuring to 23 meters (75 feet) square, but are diverse in height. The Sears Tower was actually constructed as a collection of nine separate buildings, planted together in a unifying square. It took 2,000 workers and 3 years of construction to make it into the iconic structure that it is today.Ĭonstruction began in August 1970 and was completed in May 1973. The design was inspired by an advertisement for a package of cigarettes. With 416,000 square meters (4,477,786 square feet) of space, the building is comparatively large for its height, with its foundation and the first 50 floors taking up an entire city block before the building begins to narrow.Ĭommissioned by Sears, Roebuck & Company, it was designed by the chief architect Bruce Graham and structural engineer Fazlur Khan of Skidmore, Owings & Merrill, SOM. ![]()
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