The steel is fireproofed with terra-cotta tiles and supports reinforced concrete floors. The building also made history by being the first to use liquid-filled fireproofed columns. On either side of the gate are rare examples of fireproofed plaster walls. It may be made of heavy fireproofed fabric or solid steel sheet. For its time, the building was heavily fireproofed. All fabrics, such as clothing and bedding, were fireproofed.