Stellar - 666-68 West End Ave
Multifamily Housing in New York City, NY · 660 West End Avenue · 10025
At a glance
Stellar - 666-68 West End Ave is a 297,985-square-foot multifamily housing building at 660 West End Avenue in New York City, New York, built in 1927. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 60 out of 100 (grade C), a site energy-use intensity of 92.0 kBtu/ft² and 1,820 tCO₂e of greenhouse-gas emissions. That score is higher than 41% 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 | 60 (band C) |
| Site EUI | 92.0 kBtu/ft² |
| Source EUI | 131.1 kBtu/ft² |
| GHG emissions | 1,820 tCO₂e |
| GHG intensity | 6.1 kgCO₂e/ft² |
| Electricity | 1,718,399 kWh |
| Natural gas | 215,571 therms |
| Gross floor area | 297,985 sq ft |
| Source record | nyc:2677027:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 60 | +1 | 92.0 kBtu/ft² | 1,820 tCO₂e |
| 2023 | 59 | -31 | 89.6 kBtu/ft² | 1,761 tCO₂e |
| 2022 | 90 | 56.1 kBtu/ft² | 1,084 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
- 660 West End Avenue
- City
- New York City
- State
- New York
- ZIP
- 10025
- Coordinates
- 40.79287, -73.97494
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Stellar - 666-68 West End Ave 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. Stellar - 666-68 West End Ave's ENERGY STAR score of 60 compares with an average of 63 across the 22,829 that report a score; it scores higher than 41% of them and lower than 58%. Its site EUI of 92.0 kBtu/ft² is about 23% 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 6.1 kgCO₂e/ft² is about 18% above the group average of 5.2 kgCO₂e/ft².
At 297,985 sq ft, it is about 195% above the average floor area of 100,951 sq ft for those buildings. It was built in 1927, 25 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 Stellar - 666-68 West End Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Stellar - 666-68 West End Ave, covering report years 2022–2024. Its ENERGY STAR score went from 90 in 2022 to 60 in 2024 (-30 points); its best year on file was 2022, at 90. Site EUI moved from 56.1 kBtu/ft² (2022) to 92.0 kBtu/ft² (2024), an 64% increase. Reported emissions went from 1,084 tCO₂e to 1,820 tCO₂e over the same span (up 68%).
What does an ENERGY STAR score of 60 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 60 means the building performs better than about 60% of its national peers. BuildingCensus bands the score into report-card grades; 60 falls in band C — below median (55–69). It sits 15 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. Stellar - 666-68 West End Ave's 92.0 kBtu/ft² across 297,985 sq ft works out to about 27.4 billion Btu (8,034 MWh-equivalent) in 2024. Its source EUI of 131.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,718,399 kWh of electricity and 215,571 therms of natural gas for the year.
Which law requires Stellar - 666-68 West End Ave to report its energy use?
Stellar - 666-68 West End Ave 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:2677027:2024). 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
- Dermot - 160 East 48th Street (The Buchanan)· 297,793 sq ft · score 61 (C)
- La Central A· 297,603 sq ft · score 36 (D)
- ParkHill(3)· 297,600 sq ft
- 2383 Second Avenue· 297,425 sq ft
- 75 East End Avenue· 296,940 sq ft · score 85 (A)
- Clock Tower Condominium· 296,861 sq ft · EUI 53.8 kBtu/ft²
- 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 Stellar - 666-68 West End Ave's energy grade?
Stellar - 666-68 West End Ave scores 60 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Stellar - 666-68 West End Ave use?
Its 2024 site energy-use intensity was 92.0 kBtu/ft² (131.1 kBtu/ft² source) across 297,985 sq ft, including 1,718,399 kWh of electricity and 215,571 therms of natural gas.
What are Stellar - 666-68 West End Ave's carbon emissions?
Stellar - 666-68 West End Ave reported 1,820 tCO₂e of greenhouse-gas emissions (6.1 kgCO₂e/ft²) for 2024.
Where is Stellar - 666-68 West End Ave?
Stellar - 666-68 West End Ave is at 660 West End Avenue, in New York City, New York 10025. Its coordinates are 40.79287, -73.97494 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Stellar - 666-68 West End Ave and when was it built?
Stellar - 666-68 West End Ave has 297,985 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1927 as its year built. It is classed as multifamily housing.
Is Stellar - 666-68 West End Ave 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, “Stellar - 666-68 West End Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/stellar-666-68-west-end-ave-b07d155f (data as of October 2, 2026).