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.