Q:Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Regions Center - The Regions Center (formerly the AmSouth Center before that the AmSouth-Sonat Tower and originally the First National-Southern Natural Building) is a 119 meter (390 foot) tall 30 story office tower located at northwest corner of 20th Street and 5th Avenue North in Birmingham Alabama USA. It 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.
A:
Building