Chase Tower, located in the Chicago Loop area of Chicago at 10 South Dearborn Street, is a 60 story skyscraper completed in 1969. At 850 feet (259 m) tall, it is the tenth tallest building in Chicago, the tallest building inside the Chicago 'L' Loop elevated tracks, and the 32nd tallest in the United States. Chase Bank has its U.S. and Canada commercial and retail banking headquarters here. The building is also the headquarters of Exelon. The building and its plaza (known as Exelon Plaza) occupy the entire block bounded by Clark, Dearborn, Madison, and Monroe Streets.
The building first opened in 1969 as First National Plaza. When constructed, it was the headquarters of First Chicago Corporation.  In 1998, it became the headquarters for Bank One Corporation, and accordingly it was renamed Bank One Tower. The current name dates from October 24, 2005, after Bank One merged with Chase.