Widely installed during the late nineteenth and early twentieth centuries, these round or square glass prisms were a revolutionary way to illuminate dark subterranean basements. Today, surviving vault lights are celebrated historical features in landmark neighborhoods like SoHo, Tribeca, and DUMBO, requiring strict preservation under Landmark Preservation Commission rules. Because the cast-iron frames can rust and the glass lenses can crack over time, they are highly prone to structural leaks and deterioration. Modern restoration requires specialist fabricators who can replicate the historic cast-iron panels while meeting modern loading standards.
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