 To accommodate their needs, the bank built the Annex directly behind the headquarters at 118 West Adams Street.The Annex was designed by Jacksonville architects Marsh and Saxelbye and constructed by New York City firm George A. Fuller Co. between 1925 and 1926.Though it had a different architect than the headquarters, its facade is very similar to the older building's, with white terra cotta and decorative elements such as cartouches, a balustrade, and a dentiled cornice.