 The interior construction is composed of steel framework with poured concrete floors, ceilings, and stairways.The interior walls consist of layered hollow-core "Pyrobar Blocks" (a gypsum-based fireproofing material developed in the early 1900s), with a wire mesh covering that was coated with several layers of plaster.The original main floor features a grand foyer, meeting room, ballroom, dining hall, and sitting parlors.