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Borough-Block-Lot (BBL)

Property, Zoning & Ownership Classification
Borough-Block-Lot (BBL) Borough-Block-Lot (BBL) is the three-part numeric identifier (borough, block, lot) used by NYC to uniquely locate any property.

The BBL succinctly identifies a property across municipal systems — the borough number, tax block, and lot number — and is required on permits, violation searches, and Department of Finance records; contractors and owners reference the BBL to find DOT or DOB records for sidewalk work.

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