London-based insurance broker Willis's upcoming occupation of space in Chicago's Sears Tower means a name change to the landmark Chicago building to Willis Tower. The name change officially goes into effect today.

In a Crain's Chicago Business interview, Willis CEO Joseph Plumeri talked about naming rights, possible job relocations, and the fact that Willis will be competing on the home turf of giant competitor Aon. He stated that Willis did not pay extra for naming rights; it was included in the deal leasing 142,000 square feet, which will house 500 Willis employees.

Commenting on possible sensitivity around the renaming, Plumeri said:

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