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 fifteenth-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, KPMG, and notable international law firm Holland & Knight.