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Adjust your mental encyclopedia: The nation’s tallest tower—currently known as the Sears’ Tower—will be rechristened the “Willis Tower” after its New York-based owners signed a deal with the Willis Group Holdings, a London-based insurance broker, for 140,000 square feet. Willis will consolidate its five Chicago-area offices and move 500 employees into the tower. According to the Chicago Sun-Times, “Real estate experts wondered why the tower's owners handed naming rights to a tenant that will take only 3.5 percent of the 3.8-million-square-foot building.”