4/8/2023 0 Comments Sears tower![]() The observation deck on the 103rd floor of Willis Tower is the highest observation deck in the United States. The tower is composed of nine square tube structures of different heights, and clustered in a 3×3 matrix forming a square base with 225-foot (69 m) sides, only two of these nine tubes (the center tube and the middle tube on the west) reach the top of the tower.įazlur Rahman Khan's Bundled Tube System has been also applied on some other skyscrapers in the world, one of the latest skyscraper being developed that uses this system is the Landmark 81 Tower in Ho Chi Minh City. Willis Tower was designed by Bruce Graham and Fazlur Rahman Khan of Chicago based architectural firm Skidmore, Owings & Merrill (SOM), Fazlur Rahman Khan invented the bundled tube structure for Willis Tower, it is said Willis Tower's distinctive appearance was inspired by an advertisement for a package of cigarettes. However, the roof, highest occupied floor and observation deck of Willis Tower is still higher. In the United States, the title of the country's tallest building was just overtaken by One World Trade Center in 2014, confusingly, this time CTBUH considers the antenna on One World Trade Center as integral part of its architecture element. As of 2018, Willis Tower is the 19th tallest building in the world among all the complete and topped out buildings. Petronas Towers became the new tallest buildings was because their spires are considered by CTBUH as an integral architectural element of the towers, while the antennas on Willis Tower are not, the tower didn't have the antennas when it was first built in 1973, the antennas were installed in the later in 1982. Since its completion in 1973, Willis Tower had been the tallest building in the world for 25 years, until in 1998, when Petronas Towers in Kuala Lumpur surpassed it by architectural height, not everyone admit that, as both the roof height and total height of Petronas Towers are much lower than Willis Tower. Willis Tower is 1450 feet (442m) tall by roof height and architectural height, the tower is topped with two antennas, the western antenna brings the total height of tower to 527 m. For those dislike the name of Willis Tower, the good thing is that this naming rights is valid for only 15 years, which means the building's name could be changed again after 2024. Many locals and other American people dislike the name change and continue to call the building Sears Tower. The building was renamed to Willis Tower in 2009, when London-based insurance broker Willis Group Holdings leased a portion of the building and obtained the building's naming rights, which was agreed as a part of the lease. In 1994 Sears sold the building, and the naming rights of Sears expired in 2003. ![]() Willis Tower was previously called Sears Tower, Sears developed the building in 1970s, and had been owning it since its completion. Below are some interesting facts about the Willis Tower. Previously known as Sears Tower, the tower was the tallest building in America before 2014, as of 2018 it's still the nation's tallest building measured to roof. Willis Tower is a supertall skyscraper in Chicago, the United States.
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