The Willis Tower was formerly known as the Sears Tower. It is a 108 story skyscraper with a height of 1,451 feet. Itís the tallest building in the USA and the 7th in the entire world. Itís considered one of the most visited tourist attractions in Chicago with about a million people visit the Skydeck Observatory annually. Willis tower is an ideal place for business with its high quality amenities and reliable security network.
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