Because of the narrow lot at 22 S. 3rd St, the Mechanics' Bank is one of Strickland's smallest buildings, but the challenge seems to have inspired him. The heavier square pilasters that support the corners of the portico instead of round columns and the especially fine stone carving (by his longtime partner John Struthers) help to keep the building from being overwhelmed by its bulkier neighbors. Because the side walls faced very narrow alleys, most of the building was a single high room in which a large skylight lit both the main banking room with its U-shaped mahogany counter and the president and cashier's offices, which were separated from the main room by lower partitions of wood paneling. The vault and second-story directors’ room occupied a narrower wing at the back.