RSA–BankTrust_Building
RSA Trustmark Building
Office tower in Mobile, Alabama, US
The RSA Trustmark Building, originally the First National Bank Building, is a 34 story, 424-foot (129 m) International Style office tower located in downtown Mobile, Alabama.[2] Most recently known as the AmSouth Bank Building, it had been named in honor of its largest tenant until 2006, AmSouth Bancorporation. It was renamed the GM Building by its new owner, Retirement Systems of Alabama, in 2009.[4] Following a lease agreement with BancTrust Financial Group and its community bank subsidiary, BankTrust, it was renamed again, this time to the RSA–BankTrust Building. BancTrust Financial Group was purchased in 2013 by Trustmark Corporation, a Mississippi based financial institution.[5] The building officially became the RSA Trustmark Building. Trustmark occupies 72,000 square feet (6,700 m2) of the tower, including the lobby floor and floors 25 through 31.[6]