The Botta building consists of galleries rising around a central, skylighted atrium, above an iconic staircase.[27] Its external structure features a central 130-foot (40 m) tall cylinder, and a stepped-back stone facade. Botta's interior design is marked by alternating bands of polished and flame-finished black granite on the floor, ground-level walls, and column bases; and bands of natural and black-stained wood on the reception desks and coat-check desk.[2]