Inside the building, a large marble corridor ran between the entrances at Madison Avenue and Fourth Avenue (now Park Avenue South). Accessible from this hallway was a United States Post Office branch, a Western Union telegraph booth, a bank, telephone booths, and numerous shops. Cross-passages ran north and south to 24th and 23rd Streets, and stairs led to the subway station's downtown platform. The main rotunda was at the Madison Avenue entrance, measuring square and high, from which a stairway ascended to the second floor. Within the home office, there were 38 elevators, serving 1,100 tenants. The elevators were grouped in several banks throughout the building, although these were not all connected except at the lobby. The original home office also contained an extensive fire sprinkler system with standpipes and automatic sprinklers.