181 West Madison Street is a skyscraper located in Chicago managed and leased by MB Real Estate.

It is architect Cesar Pelli's first and only completed tower in the city.

[2] The glassy office tower's most distinctive feature is its recessed crown.

The top of the building is illuminated white at the corners, as well as other various colors depending on the holiday.

The 2,000 foot (610 m) and 125-story building would have been the tallest skyscraper in the world if completed, but plans were scrapped because of a sluggish real estate market.