2343 Prospect Avenue
Multifamily Housing in New York City, NY · 10458
At a glance
2343 Prospect Avenue is a 35,500-square-foot multifamily housing building in New York City, New York, built in 1925. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 17 out of 100 (grade D), a site energy-use intensity of 137.3 kBtu/ft² and 382 tCO₂e of greenhouse-gas emissions. That score is higher than 10% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 17 (band D) |
| Site EUI | 137.3 kBtu/ft² |
| Source EUI | 168.6 kBtu/ft² |
| GHG emissions | 382 tCO₂e |
| GHG intensity | 10.8 kgCO₂e/ft² |
| Electricity | 172,869 kWh |
| Natural gas | 1,780 therms |
| Water use | 4,601 kgal |
| Gross floor area | 35,500 sq ft |
| Source record | nyc:16871872:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 17 | -5 | 137.3 kBtu/ft² | 382 tCO₂e |
| 2023 | 22 | -3 | 124.7 kBtu/ft² | 345 tCO₂e |
| 2022 | 25 | 127.1 kBtu/ft² | 337 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
- 2343 Prospect Avenue
- City
- New York City
- State
- New York
- ZIP
- 10458
- Coordinates
- 40.85266, -73.88324
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 2343 Prospect Avenue compare with other multifamily housing buildings in New York City?
The latest disclosures cover 33,022 multifamily housing buildings in New York City, out of 48,310 buildings citywide. 2343 Prospect Avenue's ENERGY STAR score of 17 compares with an average of 63 across the 22,829 that report a score; it scores higher than 10% of them and lower than 89%. Its site EUI of 137.3 kBtu/ft² is about 83% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 10.8 kgCO₂e/ft² is about twice the group average of 5.2 kgCO₂e/ft².
At 35,500 sq ft, it is about 65% below the average floor area of 100,951 sq ft for those buildings. It was built in 1925, 27 years earlier than the group's average year built (1952). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has 2343 Prospect Avenue's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 2343 Prospect Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 25 in 2022 to 17 in 2024 (-8 points); its best year on file was 2022, at 25. Site EUI moved from 127.1 kBtu/ft² (2022) to 137.3 kBtu/ft² (2024), an 8% increase. Reported emissions went from 337 tCO₂e to 382 tCO₂e over the same span (up 13%).
What does an ENERGY STAR score of 17 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 17 means the building performs better than about 17% of its national peers. BuildingCensus bands the score into report-card grades; 17 falls in band D — lowest band (1–54). It sits 58 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. 2343 Prospect Avenue's 137.3 kBtu/ft² across 35,500 sq ft works out to about 4.9 billion Btu (1,428 MWh-equivalent) in 2024. Its source EUI of 168.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 172,869 kWh of electricity, 1,780 therms of natural gas and 4,601 thousand gallons of water for the year.
Which law requires 2343 Prospect Avenue to report its energy use?
2343 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:16871872:2024). 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 multifamily housing buildings in New York City
- Perfect Management - 1324 Carroll street· 35,496 sq ft · score 72 (B)
- 1324 Carroll street· 35,496 sq ft · score 71 (B)
- Century - 125 East 93rd Street· 35,495 sq ft · score 71 (B)
- 306 West 94th Street· 35,490 sq ft · score 100 (A)
- 308 W 94th St· 35,480 sq ft · score 51 (D)
- 306 W 94th St· 35,480 sq ft · score 100 (A)
- Multifamily Housing buildings in New York City· 33,022 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 2343 Prospect Avenue's energy grade?
2343 Prospect Avenue scores 17 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 2343 Prospect Avenue use?
Its 2024 site energy-use intensity was 137.3 kBtu/ft² (168.6 kBtu/ft² source) across 35,500 sq ft, including 172,869 kWh of electricity and 1,780 therms of natural gas.
What are 2343 Prospect Avenue's carbon emissions?
2343 Prospect Avenue reported 382 tCO₂e of greenhouse-gas emissions (10.8 kgCO₂e/ft²) for 2024.
Where is 2343 Prospect Avenue?
2343 Prospect Avenue is in New York City, New York 10458. Its coordinates are 40.85266, -73.88324 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 2343 Prospect Avenue and when was it built?
2343 Prospect Avenue has 35,500 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1925 as its year built. It is classed as multifamily housing.
Is 2343 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, “2343 Prospect Avenue, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/2343-prospect-avenue-83a0f5e1 (data as of October 2, 2026).