Rocklyn: 310 Prospect Park West
Office in New York City, NY · 310 Prospect Park West · 11215
At a glance
Rocklyn: 310 Prospect Park West is a 57,299-square-foot office building in New York City, New York, built in 1968. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 80 out of 100 (grade B), a site energy-use intensity of 48.0 kBtu/ft² and 237 tCO₂e of greenhouse-gas emissions. That score is higher than 52% of the 2,519 scored office buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 80 (band B) |
| Site EUI | 48.0 kBtu/ft² |
| Source EUI | 100.3 kBtu/ft² |
| GHG emissions | 237 tCO₂e |
| GHG intensity | 4.1 kgCO₂e/ft² |
| Electricity | 478,360 kWh |
| Natural gas | 11,192 therms |
| Water use | 509 kgal |
| Gross floor area | 57,299 sq ft |
| Source record | nyc:5205191:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 80 | +1 | 48.0 kBtu/ft² | 237 tCO₂e |
| 2022 | 79 | 52.3 kBtu/ft² | 211 tCO₂e |
Compliance context
Local Law 84 (LL84)
Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 310 Prospect Park West
- City
- New York City
- State
- New York
- ZIP
- 11215
- Coordinates
- 40.65696, -73.98365
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Rocklyn: 310 Prospect Park West compare with other office buildings in New York City?
The latest disclosures cover 3,384 office buildings in New York City, out of 48,310 buildings citywide. Rocklyn: 310 Prospect Park West's ENERGY STAR score of 80 compares with an average of 72 across the 2,519 that report a score; it scores higher than 52% of them and lower than 46%. Its site EUI of 48.0 kBtu/ft² is about 26% below the average of 64.5 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.1 kgCO₂e/ft² is about 29% below the group average of 5.8 kgCO₂e/ft².
At 57,299 sq ft, it is about 72% below the average floor area of 205,440 sq ft for those buildings. It was built in 1968, 28 years later than the group's average year built (1940). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Rocklyn: 310 Prospect Park West's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for Rocklyn: 310 Prospect Park West, covering report years 2022–2023. Its ENERGY STAR score went from 79 in 2022 to 80 in 2023 (+1 points). Site EUI moved from 52.3 kBtu/ft² (2022) to 48.0 kBtu/ft² (2023), a 8% decrease. Reported emissions went from 211 tCO₂e to 237 tCO₂e over the same span (up 12%).
What does an ENERGY STAR score of 80 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 80 means the building performs better than about 80% of its national peers. BuildingCensus bands the score into report-card grades; 80 falls in band B — above median (70–84). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In New York City, 43% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Rocklyn: 310 Prospect Park West's 48.0 kBtu/ft² across 57,299 sq ft works out to about 2.8 billion Btu (806 MWh-equivalent) in 2023. Its source EUI of 100.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 478,360 kWh of electricity, 11,192 therms of natural gas and 509 thousand gallons of water for the year.
Which law requires Rocklyn: 310 Prospect Park West to report its energy use?
Rocklyn: 310 Prospect Park West reports under Local Law 84 (LL84), the legal basis of New York City's Energy and Water Data Disclosure program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record nyc:5205191:2023). Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
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- Office buildings in New York City· 3,384 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
- Most efficient large buildings in New York City
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Frequently asked questions
What is Rocklyn: 310 Prospect Park West's energy grade?
Rocklyn: 310 Prospect Park West scores 80 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Rocklyn: 310 Prospect Park West use?
Its 2023 site energy-use intensity was 48.0 kBtu/ft² (100.3 kBtu/ft² source) across 57,299 sq ft, including 478,360 kWh of electricity and 11,192 therms of natural gas.
What are Rocklyn: 310 Prospect Park West's carbon emissions?
Rocklyn: 310 Prospect Park West reported 237 tCO₂e of greenhouse-gas emissions (4.1 kgCO₂e/ft²) for 2023.
Where is Rocklyn: 310 Prospect Park West?
Rocklyn: 310 Prospect Park West is in New York City, New York 11215. Its coordinates are 40.65696, -73.98365 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Rocklyn: 310 Prospect Park West and when was it built?
Rocklyn: 310 Prospect Park West has 57,299 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1968 as its year built. It is classed as office.
Is Rocklyn: 310 Prospect Park West covered by Local Law 84 (LL84)?
Yes — it appears in the 2023 Energy and Water Data Disclosure disclosure, which lists the buildings reporting under Local Law 84 (LL84).
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About this data
Source: Energy and Water Data Disclosure (Local Law 84 (LL84)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Rocklyn: 310 Prospect Park West, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/rocklyn-310-prospect-park-west-dae821bf (data as of October 2, 2026).