About 100 North Tampa
100 North Tampa, formerly known as the Regions Building and the AmSouth Building, is a skyscraper in Tampa, Florida, USA. Rising to a height of 579 feet (176 m) and 42 floors in Downtown Tampa, the structure currently stands as the tallest building in Tampa and the ninth-tallest building in Florida. 100 North Tampa was designed by the HKS, Inc. architectural firm, headquartered in Dallas, Texas. The building, an example of Postmodern architecture, holds offices for Regions Bank, the American International Group and notable international law firm Holland & Knight. 100 North Tampa began construction after a groundbreaking ceremony in May 1990, and was completed and opened in June 1992. Civil Engineering and Surveying for the structure was completed by John Herrick, PE, PLS of Greiner Engineering. The building was designed as the Citizens and Southern Bank Plaza, but opened in 1992 as the AmSouth Building after its primary tenant, AmSouth Bancorporation. AmSouth merged with Regions Bank on May 25, 2005, and the building was renamed the Regions Building. However, shortly thereafter, the building's owners adopted its street address as the structure's official name.