Woolworth Building, switchboard.

Woolworth Building. Detail of switchboard.

Woolworth Building, vault.

Woolworth Building, general exterior.

Woolworth Building, engine room.

Woolworth Building, swimming tank.

Woolworth Building, rendering.

Woolworth Building. Engine room.

Woolworth Building, engine room.

Woolworth Building. Grand staircase.

Woolworth Building. Grand staircase.

Woolworth Building, boiler room.

Woolworth Building. Corridor on 24th Floor, Woolworth offices.

Woolworth Building. Safe deposit vault.

Woolworth Building, general exterior.

233 Broadway. Woolworth Building.

Woolworth Building, engine room.

Woolworth Building, boiler room.

Woolworth Building, engine room.

Woolworth Building. Pump room.