The very thick wall behind the desk (6 feet at ground level) is evidence of the masonry used by Burnham and Root for structural support. Later, Holabird and Roche used steel framing for structural support in the southern half of the building.
The very thick wall behind the desk (6 feet at ground level) is evidence of the masonry used by Burnham and Root for structural support. Later, Holabird and Roche used steel framing for structural support in the southern half of the building.
