55 PROSPECT STREET
Office building · Brooklyn · 11201
At a glance
55 PROSPECT STREET in Brooklyn, NY is listed on the New York City property roll as “Office building”, BBL 3000630001. The roll records 256,057 sq ft of building area, 10 floors, a 1967 build year and an assessed value of $24,904,800.
The building's own benchmarking filing
Energy performance
From the building's own filing under its city's benchmarking ordinance. An ENERGY STAR score of 75 or above means the building outperforms three quarters of comparable buildings nationally. It is a self-reported figure, verified by the city only to the extent the ordinance requires.
New York City assessment roll
Parcel record
| Field | Value |
|---|---|
| BBL | 3000630001 |
| Site address | 55 PROSPECT STREET |
| Land use (DOR) | O6 — Office building |
| Building area (actual) | 256,057 sq ft |
| Floors / units / buildings | 10 / 48 / 1 |
| Lot size | 20,704 sq ft |
| Year built | 1967 |
| Zoning (primary) | — |
| Land value | $544,500 |
| Building value | — |
| Total assessed value | $24,904,800 |
Recorded owner (assessment roll)
RFR/K 55 PROSPECT OWNER LLC
Owner mailing address: not listed
Location
- Address
- 55 PROSPECT STREET
- City
- Brooklyn
- ZIP
- 11201
- Coordinates
- 40.70089, -73.98819
Within ~650 m
Nearby office buildings
- 135 PIERREPONT STREET0 tenants
725,991 sq ft · 19 fl · 1987
- 20 JAY STREET0 tenants
500,000 sq ft · 11 fl · 1909
- 45 MAIN STREET0 tenants
476,000 sq ft · 12 fl · 1906
- 39 WASHINGTON STREET0 tenants
448,300 sq ft · 9 fl · 1904
- 55 WATER STREET0 tenants
392,162 sq ft · 5 fl · 1900
- 68 JAY STREET0 tenants
320,000 sq ft · 10 fl · 1914
How does 55 PROSPECT STREET compare with other New York office buildings?
At 256,057 sq ft, 55 PROSPECT STREET is about 4 times the size of the average office building on the New York City roll, which comes to 67,377 sq ft across 7,166 buildings.
With 10 floors it is one of 1,158 office buildings of ten or more floors in the metro.
Its assessed value works out to $97 per square foot of building area, against $157 across all office floor area on the roll.
What has happened at 55 PROSPECT STREET recently?
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “Office building” mean for this parcel?
The New York City roll classifies BBL 3000630001 as “Office building” (use code O6). 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 55 PROSPECT STREET?
The recorded owner on the New York City assessment roll (current) is RFR/K 55 PROSPECT OWNER LLC.
How big is 55 PROSPECT STREET?
The New York City roll records 256,057 sq ft of building area, 10 floors, a build year of 1967. It sits on a 20,704 sq ft lot.
What is the assessed value of 55 PROSPECT STREET?
$24,904,800 on the New York City roll. Assessed values are taxable-roll figures, not market prices.
What is the BBL for 55 PROSPECT STREET?
BBL 3000630001, site address 55 PROSPECT 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 55 PROSPECT 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 3000630001.
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, “55 PROSPECT STREET, Brooklyn, NY (BBL 3000630001)”, https://buildingcensus.com/offices/nyc/office-building-07b67e3f (data as of September 11, 2026).