What Is a BBL Number in NYC? (And How to Find Yours)
What is a BBL?
BBL stands for Borough-Block-Lot — the unique ID New York City assigns to every tax lot. It’s one digit for the borough, five for the block, and four for the lot: 10 digits total. BBL 1-00832-0061 means Manhattan (1), block 832, lot 61. Every city system that touches property — tax bills, ACRIS deeds, PLUTO, DOB permits — keys off it.
| Borough code | Borough |
|---|---|
| 1 | Manhattan |
| 2 | Bronx |
| 3 | Brooklyn |
| 4 | Queens |
| 5 | Staten Island |
Find any address’s BBL
Where you’ll need it
- ACRIS — searching deeds and mortgages by parcel uses borough + block + lot (see how to look up sale prices).
- DOF — property tax bills and assessment notices print the BBL on every page.
- DOB / permits — building applications and violations are filed by BBL.
Condos and co-ops: one building, many lots
Each condo unit is its own tax lot (typically lot 1001 and up), so a condo building has hundreds of BBLs plus a base lot for the shared land (often lot 7501+). A co-op is the opposite: the whole building is one tax lot — individual apartments don’t have BBLs, because shareholders own stock, not real property.
See the full record behind any BBL →
Frequently asked questions
What is a BBL number in NYC?
BBL is the Borough-Block-Lot identifier — a 10-digit ID (1 borough digit, 5 block digits, 4 lot digits) the city assigns to every tax lot. Borough codes: 1 Manhattan, 2 Bronx, 3 Brooklyn, 4 Queens, 5 Staten Island.
How do I find my BBL?
It’s printed on your property tax bill and assessment notice, or you can type your address into a free lookup — BlockBook resolves any NYC address to its BBL using the city’s GeoSearch service.
Does a co-op apartment have its own BBL?
No — the entire co-op building is one tax lot with one BBL, because shareholders own shares in the corporation rather than real property. Condo units, by contrast, each have their own lot (usually numbered 1001 and up).
Figures computed from official NYC Department of Finance and NYC Open Data records, refreshed automatically — see how BlockBook sources its data. Spot an error? Tell us.
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Informational only — not financial, legal, or tax advice. See the disclaimer.