By the 1930s, tenants required more space and two wings were added to the building between 1936 and 1938. Louis A. Simon, supervising architect of the US Treasury, designed the wings in a style compatible with that of the original building.
The structure is located on the northern edge of downtown bounded by Waianuenue Avenue, Wailuku Drive, and Kinoole and Kekaulike streets at 154 Waianuenue Avenue (Route 200), , on Kalakaua Park square.