The building has a brick, brownstone and terra cotta polychromy exterior featuring rounded arches with terra cotta detailing – Kimball was noted for his innovative use of terra cotta[1] – and its interior vaulted ceilings employ a Guastavino tile system. Structurally, it preceded the use of steel skeletons for skyscrapers, utilizing cast-iron beams and masonry walls that were load-bearing.[3]