The 1,451-foot tall Chicago skyscraper now named the Willis Tower is the second tallest building in the United States and the eighth in the world. Sears Tower's name changed in 2009 and has a SkyDeck on the 103rd Floor that is a popular tourist attraction. It was designed for Sears, Roebuck & Co. by architect Bruce Graham and engineer Fazlur Khan and opened in 1973. The building has 3.8 million square feet of office and retail space.
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