671 Prospect Avenue
K-12 School in New York City, NY · 10455
At a glance
671 Prospect Avenue is a 38,000-square-foot K-12 school in New York City, New York, built in 1915. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 37 out of 100 (grade D), a site energy-use intensity of 82.0 kBtu/ft² and 224 tCO₂e of greenhouse-gas emissions. That score is higher than 18% of the 2,052 scored K-12 school buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 37 (band D) |
| Site EUI | 82.0 kBtu/ft² |
| Source EUI | 129.8 kBtu/ft² |
| GHG emissions | 224 tCO₂e |
| GHG intensity | 5.9 kgCO₂e/ft² |
| Electricity | 278,252 kWh |
| Natural gas | 21,648 therms |
| Gross floor area | 38,000 sq ft |
| Source record | nyc:8722654:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 37 | -32 | 82.0 kBtu/ft² | 224 tCO₂e |
| 2023 | 69 | -26 | 50.5 kBtu/ft² | 147 tCO₂e |
| 2022 | 95 | 21.4 kBtu/ft² | 67 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
- 671 Prospect Avenue
- City
- New York City
- State
- New York
- ZIP
- 10455
- Coordinates
- 40.81551, -73.90331
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 671 Prospect Avenue compare with other K-12 school buildings in New York City?
The latest disclosures cover 2,301 K-12 school buildings in New York City, out of 48,310 buildings citywide. 671 Prospect Avenue's ENERGY STAR score of 37 compares with an average of 64 across the 2,052 that report a score; it scores higher than 18% of them and lower than 81%. Its site EUI of 82.0 kBtu/ft² is about 34% above the average of 61.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 5.9 kgCO₂e/ft² is about 23% above the group average of 4.8 kgCO₂e/ft².
At 38,000 sq ft, it is about 63% below the average floor area of 101,338 sq ft for those buildings. It was built in 1915, 38 years earlier than the group's average year built (1954). Across all 24 jurisdictions BuildingCensus covers, the 6,548 K-12 school buildings average an ENERGY STAR score of 64 and a site EUI of 52.7 kBtu/ft².
How has 671 Prospect Avenue's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 671 Prospect Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 95 in 2022 to 37 in 2024 (-58 points); its best year on file was 2022, at 95. Site EUI moved from 21.4 kBtu/ft² (2022) to 82.0 kBtu/ft² (2024), an 283% increase. Reported emissions went from 67 tCO₂e to 224 tCO₂e over the same span (up 233%).
What does an ENERGY STAR score of 37 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 37 means the building performs better than about 37% of its national peers. BuildingCensus bands the score into report-card grades; 37 falls in band D — lowest band (1–54). It sits 38 points below 75, the threshold for ENERGY STAR certification. 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. 671 Prospect Avenue's 82.0 kBtu/ft² across 38,000 sq ft works out to about 3.1 billion Btu (913 MWh-equivalent) in 2024. Its source EUI of 129.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 278,252 kWh of electricity and 21,648 therms of natural gas for the year.
Which law requires 671 Prospect Avenue to report its energy use?
671 Prospect Avenue 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 2024 disclosure (source record nyc:8722654:2024). 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.
More K-12 school buildings in New York City
- 265 Marcus Garvey Avenue· 37,861 sq ft · score 96 (A)
- 0230 - St Benedict· 37,800 sq ft · score 79 (B)
- 148 West 90 Street· 37,750 sq ft · score 40 (D)
- 1348 53rd Street· 37,700 sq ft · score 1 (D)
- 1960 Benedict Avenue· 37,625 sq ft · score 97 (A)
- National Energy Cost Services Inc:611 FLUSHING AVENUE· 37,499 sq ft · score 60 (C)
- K-12 School buildings in New York City· 2,301 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
- Most efficient large buildings in New York City
- Least efficient large buildings in New York City
- Biggest emitters in New York City
Frequently asked questions
What is 671 Prospect Avenue's energy grade?
671 Prospect Avenue scores 37 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 671 Prospect Avenue use?
Its 2024 site energy-use intensity was 82.0 kBtu/ft² (129.8 kBtu/ft² source) across 38,000 sq ft, including 278,252 kWh of electricity and 21,648 therms of natural gas.
What are 671 Prospect Avenue's carbon emissions?
671 Prospect Avenue reported 224 tCO₂e of greenhouse-gas emissions (5.9 kgCO₂e/ft²) for 2024.
Where is 671 Prospect Avenue?
671 Prospect Avenue is in New York City, New York 10455. Its coordinates are 40.81551, -73.90331 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 671 Prospect Avenue and when was it built?
671 Prospect Avenue has 38,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1915 as its year built. It is classed as K-12 school.
Is 671 Prospect Avenue covered by Local Law 84 (LL84)?
Yes — it appears in the 2024 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, “671 Prospect Avenue, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/671-prospect-avenue-a844f182 (data as of October 2, 2026).