These subterranean spaces are highly common in historic commercial districts across NYC, where they were originally constructed to store coal or provide natural light. Under NYC Administrative Code Section 19-117, maintaining a vault requires a specific license and is subject to structural inspections by the city. Property owners bear full liability for the structural integrity of the vault's ceiling slab, which functions directly as the public walking surface above. Any signs of water infiltration, cracking concrete, or sagging steel supports within the space must be addressed immediately by a licensed structural engineer to prevent sudden collapses.
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