The building served as the corporate headquarters for AmSouth Bancorporation from 1972 until 2006, and Sonat, Inc. and its subsidiaries from 1972 until 2007, when it relocated to the Colonial Brookwood Center.

The reflective glass skin stretches between a generously scaled black granite base story and a louvered steel penthouse enclosure.

A one-story banking lobby facing 20th Street closes off the north side of a sunken courtyard which serves the basement-level cafeteria.

On January 29, 2007, Southern Natural announced that it would move its headquarters to the Colonial Brookwood Center, located in one of Birmingham's suburbs.

During the Christmas season, 2,200 colored gels are illuminated above each panel of the glass curtain wall, creating an enormous lit graphical display visible on the skyline from several vantage points around the city.