42 ADELPHI STREET
Office building · Brooklyn · 11205
At a glance
42 ADELPHI STREET in Brooklyn, NY is listed on the New York City property roll as “Office building”, BBL 3020310050. The roll records 6,322 sq ft of building area, 2 floors, a 1899 build year and an assessed value of $136,800.
New York City assessment roll
Parcel record
| Field | Value |
|---|---|
| BBL | 3020310050 |
| Site address | 42 ADELPHI STREET |
| Land use (DOR) | O8 — Office building |
| Building area (actual) | 6,322 sq ft |
| Floors / units / buildings | 2 / 2 / 1 |
| Lot size | 4,479 sq ft |
| Year built | 1899 |
| Zoning (primary) | — |
| Land value | $136,800 |
| Building value | — |
| Total assessed value | $136,800 |
Recorded owner (assessment roll)
No owning organisation shown. Where the county roll names a private individual, the name and mailing address are not published here.
Location
- Address
- 42 ADELPHI STREET
- City
- Brooklyn
- ZIP
- 11205
- Coordinates
- 40.69664, -73.97278
Within ~650 m
Nearby office buildings
- 36 WAVERLY AVENUE0 tenants
49,000 sq ft · 4 fl · 1935
- 18 CUMBERLAND STREET0 tenants
32,755 sq ft · 5 fl · 1920
- 11 ADELPHI STREET0 tenants
27,422 sq ft · 3 fl · 1908
- 77 WASHINGTON AVENUE0 tenants
22,080 sq ft · 6 fl · 1930
- 156 FLUSHING AVENUE0 tenants
13,268 sq ft · 4 fl · 1930
- 210 FLUSHING AVENUE0 tenants
9,600 sq ft · 2 fl · 1930
How does 42 ADELPHI STREET compare with other New York office buildings?
At 6,322 sq ft, 42 ADELPHI STREET is less than a tenth the size of the average office building on the New York City roll, which comes to 67,377 sq ft across 7,166 buildings.
Its assessed value works out to $22 per square foot of building area, against $157 across all office floor area on the roll.
What does “Office building” mean for this parcel?
The New York City roll classifies BBL 3020310050 as “Office building” (use code O8). BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns 42 ADELPHI STREET?
No owning organisation is shown for this parcel. Where the county roll names a private individual as owner, BuildingCensus does not publish the name or mailing address.
How big is 42 ADELPHI STREET?
The New York City roll records 6,322 sq ft of building area, 2 floors, a build year of 1899. It sits on a 4,479 sq ft lot.
What is the assessed value of 42 ADELPHI STREET?
$136,800 on the New York City roll. Assessed values are taxable-roll figures, not market prices.
What is the BBL for 42 ADELPHI STREET?
BBL 3020310050, site address 42 ADELPHI STREET, Brooklyn. It is the key to look the parcel up in the Department of City Planning PLUTO extract and Department of Finance rolling sales (New York City).
More around 42 ADELPHI STREET
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- New York City — Department of City Planning PLUTO extract and Department of Finance rolling sales. The city publishes no owner mailing address, so landlord portfolios cannot be grouped here, and its business licences cover regulated trades rather than office tenants.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
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Dataset updated . Source: New York City assessment roll, BBL 3020310050.
About this data
Source: Department of City Planning PLUTO extract and Department of Finance rolling sales (New York City), as published September 11, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “42 ADELPHI STREET, Brooklyn, NY (BBL 3020310050)”, https://buildingcensus.com/offices/nyc/office-building-0a2bff65 (data as of September 11, 2026).