Tower Sears Roebuck, and Co. from 1970 to 1974 built, 1,450 ft (442 m) rises to a height of 110 stories. 253 ft (77 m) television antenna topping it the 1,703 ft (519 m) makes the world's third largest freestanding structure. Skidmore Owings, and Merrill was designed by the firm, tubes Sears Tower, the architectural engineer Fazlur Kahn, a technical innovation from the big tower was developed specially for welded steel with floors suspended within the tubes are supported structurally by square. Sears Tower by black band black aluminum and bronze toned - an outer glass is reduced. Source: Columbia Encyclopedia.
Fun fact: A clear day, visitors to the top of Sears Tower, Indiana, Wisconsin and Michigan, I can see.
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