Willis Tower To Be Renovated To Improve Efficiency

CHICAGO (CBS) - Chicago's tallest building will be renovated starting next month.

Workers will begin replacing all of the elevators inside Willis Tower.

It's part of a five-year project set to begin in May.

The half-billion dollar renovations are designed to improve efficiency.

The building's 80 elevators make more than 46,000 trips every day, taking about six million people up-and-down the 110 floors every year.

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