645 Prospect
Multifamily Housing in New York City, NY · 645 Prospect Ave · 10455
At a glance
645 Prospect is a 112,536-square-foot multifamily housing building at 645 Prospect Ave in New York City, New York, built in 1982. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 44 out of 100 (grade D), a site energy-use intensity of 75.5 kBtu/ft² and 575 tCO₂e of greenhouse-gas emissions. That score is higher than 27% 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 | 44 (band D) |
| Site EUI | 75.5 kBtu/ft² |
| Source EUI | 110.2 kBtu/ft² |
| GHG emissions | 575 tCO₂e |
| GHG intensity | 5.1 kgCO₂e/ft² |
| Electricity | 583,998 kWh |
| Natural gas | 65,012 therms |
| Water use | 9,547 kgal |
| Gross floor area | 112,536 sq ft |
| Source record | nyc:18100486:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 44 | +4 | 75.5 kBtu/ft² | 575 tCO₂e |
| 2023 | 40 | ±0 | 75.2 kBtu/ft² | 561 tCO₂e |
| 2022 | 40 | 81.7 kBtu/ft² | 554 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
- 645 Prospect Ave
- City
- New York City
- State
- New York
- ZIP
- 10455
- Coordinates
- 40.81478, -73.90359
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 645 Prospect 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. 645 Prospect's ENERGY STAR score of 44 compares with an average of 63 across the 22,829 that report a score; it scores higher than 27% of them and lower than 72%. Its site EUI of 75.5 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 5.1 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².
At 112,536 sq ft, it is about 11% above the average floor area of 100,951 sq ft for those buildings. It was built in 1982, 30 years later 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 645 Prospect's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 645 Prospect, covering report years 2022–2024. Its ENERGY STAR score went from 40 in 2022 to 44 in 2024 (+4 points). Site EUI moved from 81.7 kBtu/ft² (2022) to 75.5 kBtu/ft² (2024), a 8% decrease. Reported emissions went from 554 tCO₂e to 575 tCO₂e over the same span (up 4%).
What does an ENERGY STAR score of 44 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 44 means the building performs better than about 44% of its national peers. BuildingCensus bands the score into report-card grades; 44 falls in band D — lowest band (1–54). It sits 31 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. 645 Prospect's 75.5 kBtu/ft² across 112,536 sq ft works out to about 8.5 billion Btu (2,490 MWh-equivalent) in 2024. Its source EUI of 110.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 583,998 kWh of electricity, 65,012 therms of natural gas and 9,547 thousand gallons of water for the year.
Which law requires 645 Prospect to report its energy use?
645 Prospect 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:18100486:2024). 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
- Clinton - 27 North 6th Street· 112,534 sq ft · score 48 (D)
- 3363 Sedgwick Ave· 112,530 sq ft · score 71 (B)
- Gentry Apartments Inc (330 Lenox Road)· 112,518 sq ft · score 100 (A)
- Hope Gardens Building 4· 112,500 sq ft · score 66 (C)
- BROWNSVILLE GARDENS - 6275 - Michaels· 112,500 sq ft · score 22 (D)
- 517 West 121st Street· 112,500 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 645 Prospect's energy grade?
645 Prospect scores 44 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 645 Prospect use?
Its 2024 site energy-use intensity was 75.5 kBtu/ft² (110.2 kBtu/ft² source) across 112,536 sq ft, including 583,998 kWh of electricity and 65,012 therms of natural gas.
What are 645 Prospect's carbon emissions?
645 Prospect reported 575 tCO₂e of greenhouse-gas emissions (5.1 kgCO₂e/ft²) for 2024.
Where is 645 Prospect?
645 Prospect is at 645 Prospect Ave, in New York City, New York 10455. Its coordinates are 40.81478, -73.90359 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 645 Prospect and when was it built?
645 Prospect has 112,536 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1982 as its year built. It is classed as multifamily housing.
Is 645 Prospect 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, “645 Prospect, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/645-prospect-3745c5bf (data as of October 2, 2026).