The Atlantic National Bank, established in 1903, had built the Atlantic National Bank Building (now 121 Atlantic Center) on 121 West Forsyth Street in 1909.[2] By 1925 the bank had grown such that it required additional space. To accommodate their needs, the bank built the Annex directly behind the headquarters at 118 West Adams Street.[3]
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 dentiledcornice. The building stands ten stories high and cost around $400,000 to build.[3]