The lawsuits said that above the 67th floor would make television signals bad. Legal action Īs the construction of the building reached as the 50th floor in 1972, people sued Sears and wanted to stop the building from passing 67 floors. It was done to improve reception of local NBC station WMAQ-TV. The western antenna was made bigger, bringing the overall height to 1,729 feet (527 m) on June 5, 2000. In February 1982, two television antennas were added to the building, increasing its total height to 1,707 feet (520.3 m). ![]() There are around 40,000 sprinkler heads in the building. Even though adding a fire sprinkler system was not forced, the building was built with one from the beginning. These give the building's environmental support systems and hide its belted trusses. īlack bands appear on the tower around the 29th–32nd, 64th–65th, 88th–89th, and 104th–108th floors. The building was completed in May 1973 and opened the next year. Two antennas were added at the top of the building for television and radio broadcasting. The height was limited by the Federal Aviation Administration (FAA) to protect air traffic. The tower passed the height of New York's unfinished World Trade Center to become the world's tallest building. They also added metal floors with many setbacks, which would give the tower its well known look. Skidmore architects proposed a tower with large, 55,000-square-foot (5,100 m 2) floors in the lower part of the building. Small metal floors were added to give enough space to people working in the tower. With the floors left over Sears decided to rent them to other companies for offices. The system became successful in skyscraper construction and has been used in most supertall buildings. At 1,450 feet, it had more space and was higher than the Empire State Building. The Sears Tower was the first building to use this design. The last west and center tubes reach 108 floors. The northeast and southwest tubes reach the 66th floor with the north, east, and south tubes end at the 90th. All nine tubes would rise up to the 50th floor of the building, where the northwest and southeast tubes end. It was connected in a 3×3 metal wrap forming a square base with 225-foot (69 m) sides. They designed it as a nine square " tubes". Architects Bruce Graham and Fazlur Khan designed the building. Sears paid for construction of the building. They hired architects Skidmore, Owings & Merrill (SOM). Sears needed 3 million square feet (280,000 m 2) of office space for its planned tower. Sears and the city of Chicago approved the design and construction began in April 1971. Sears eventually bought the West Chicago loop location and bought 15 old buildings from 100 owners and paid $2.7 million to the city. The company was given a location by West Chicago Loop not far from Grant Park. Sears wanted to put many of its employees into one building on the western part of Chicago's Loop. was the largest retailer in the world, with about 350,000 employees. History Planning and construction The tower during its construction, 1973 ![]() Many people from Chicago still call the tower by its original name. It was known as the Sears Tower until 2009, as it was the headquarters of retail company Sears from its opening in 1974. Morgan Stanley moved into the tower in 2019. Other major company offices in the tower include Schiff Hardin and Seyfarth Shaw. The building's largest office partner is United Airlines, which moved its corporate headquarters from 77 West Wacker Drive in 2012. The tower was renamed in 2009 after the Willis Group bought the tower. It is one of Chicago's most popular tourist places. Each year, more than one million people visit its observation deck, the highest in the United States. It is also the 23rd-tallest in the world. ![]() As of 2021, it is the third-tallest building in the United States and the Western hemisphere. Willis Tower is seen as the best work of architect Fazlur Khan. It was also the tallest building in the Western Hemisphere for 41 years, until the new One World Trade Center beat it in 2013. It was the tallest building in the world for twenty-five years until the Petronas Towers were built in Malaysia. When it finished costruction in 1973, it beat the World Trade Center in New York City to become the tallest building in the world. ![]() The tower has 108 stories, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110. The Willis Tower, formerly known as the Sears Tower, is a 108- story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois. Location in the United States Show map of the United States
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