The symmetrical facade faces west onto South Third Street and first story is clad with deeply incised rusticated New Hampshire granite. This first-story articulation is a character-defining feature of Second Renaissance Revival architecture. A belt course divides the first and second levels. Smooth Indiana limestone panels clad the upper stories. Recessed bays flank a central, seven-bay, projecting pavilion. The street level is dominated by a series of regularly spaced round-arch openings containing both double-hung sash windows and entry doors, all of which feature fanlights. Radiating voussoirs surround each of the arched openings. Recessed entrances are located at each end of the projecting pavilion, and the entry stairs are flanked by tall, cast-bronze pedestal lamps topped with spherical globes. Articulated voussoirs capped with pediments top the pavilion's second story flat-arch windows. Textured consoles featuring anthemia leaves support the pediment's gable returns. Projecting window sills are supported by brackets that flank simple rectangular panels. Smaller square windows with prominent scrolled keystones are aligned above the second-story windows. Upper story windows are separated by two-story engaged Ionic order columns that form an impressive colonnade that dominates the central upper bays of the facade. The colonnade supports an unadorned architrave and frieze that are surmounted by a molded cornice with prominent modillion blocks. A parapet with a classical balustrade tops the building. The architects of subsequent additions successfully designed them to be compatible with the existing building. The wings, added in 1940, extend to the east on both the north and south elevations and employ similar materials and design tenets. However, instead of modillion blocks, a convex molding is in place on the wings' cornice. South wing walls are clad in buff-colored brick. The 1987 infill uses a similar brick finish. Interior spaces retain many original materials and features. Although no longer a tenant, the post office originally occupied the first floor. Large round-arched postal windows with oak frames and sash remain in the postal lobby. Bronze postal lock boxes featuring Greek key patterns also allude to the space's prior use. Floors are covered in terrazzo with dark marble borders. The baseboard and wainscot are grey Vermont Light Cloud Rutland marble, while remaining wall surfaces are covered in plaster. A coffered ceiling tops the lobby and features pendant lights that date to 1940.