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Chicago, Illinois
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From its completion in 1973 until 1998, the Willis Tower held the title of the world's tallest building, surpassing the World Trade Center in New York City.
The Willis Tower is equipped with 104 elevators, making it one of the most elevator-dense buildings in the world.
The Skydeck on the 103rd floor includes 'The Ledge,' a glass balcony extending four feet outside the building, offering breathtaking views of Chicago.
The building's structure required approximately 76,000 tons of steel, a testament to its robust design.
Due to its size and the number of businesses it houses, the Willis Tower has its own unique zip code: 60606.
The building has undergone significant retrofitting to improve energy efficiency, including the installation of energy-saving LED lights and a green roof.
It was originally called the Sears Tower, named after the retail company that commissioned its construction.
The Skydeck attracts over 1.7 million visitors each year, making it one of Chicago's most popular tourist destinations.
The tower's antenna broadcasts signals for numerous television and radio stations, serving as a critical communication hub for the region.
