The Willis Tower (formerly the Sears Tower) is a 108-story,
1,450-foot (442.1 m) skyscraper in Chicago
build by engineer
Fazlur Rahman Khan..
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...Known as the Sears Tower from its construction until the naming
rights were included in a 2009 lease with the
Willis Group
Holdings a multinational risk advisor, insurance brokerage and
reinsurance brokerage company with its headquarters in the Willis
Building in London until its merger of equals with financial
services company Towers Watson in 2016
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