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.
Frequently Asked Questions About Borough-Block-Lot (BBL)
What is a BBL?
The Borough-Block-Lot identifier, a three-part number that uniquely identifies any property in New York City.
What are the three parts?
The borough number, the tax block number and the lot number within that block.
Where is the BBL used?
On permit applications, violation searches and Department of Finance records, making it the key for locating a property's sidewalk history.
How do I look up my BBL?
Through City property lookup tools by entering the address, or from a property tax bill or deed.