125 West End Ave/320 W 66th St
Office in New York City, NY · 320 W 66th St · 10023
At a glance
125 West End Ave/320 W 66th St is a 504,664-square-foot office building in New York City, New York, built in 1984. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 32.9 kBtu/ft² and 1,587 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 32.9 kBtu/ft² |
| Source EUI | 71.1 kBtu/ft² |
| GHG emissions | 1,587 tCO₂e |
| GHG intensity | 3.1 kgCO₂e/ft² |
| Electricity | 2,920,225 kWh |
| Gross floor area | 504,664 sq ft |
| Source record | nyc:60203392:2024 |
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
- 320 W 66th St
- City
- New York City
- State
- New York
- ZIP
- 10023
- Coordinates
- 40.77616, -73.98759
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 125 West End Ave/320 W 66th St 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. Its site EUI of 32.9 kBtu/ft² is about half of 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 3.1 kgCO₂e/ft² is about half of the group average of 5.8 kgCO₂e/ft².
At 504,664 sq ft, it is about 146% above the average floor area of 205,440 sq ft for those buildings. It was built in 1984, 44 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.
What does a site EUI of 32.9 kBtu/ft² mean?
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. 125 West End Ave/320 W 66th St's 32.9 kBtu/ft² across 504,664 sq ft works out to about 16.6 billion Btu (4,866 MWh-equivalent) in 2024. Its source EUI of 71.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,920,225 kWh of electricity for the year.
Which law requires 125 West End Ave/320 W 66th St to report its energy use?
125 West End Ave/320 W 66th St 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:60203392:2024). 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 office buildings in New York City
- 757 Third Avenue (Brightly)· 504,630 sq ft · score 81 (B)
- 28-40 West 23rd Street - parent· 503,787 sq ft · EUI 61.8 kBtu/ft²
- Feil - 30-20 Thomson Avenue· 503,650 sq ft · score 50 (D)
- 2 MetroTech Center (90 MYRTLE AVENUE)· 502,581 sq ft · score 74 (B)
- Livingston Plaza· 500,000 sq ft
- 225 Park Ave South (221 PARK AVE S)· 499,464 sq ft · score 80 (B)
- 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
- Least efficient large buildings in New York City
- Biggest emitters in New York City
Frequently asked questions
What is 125 West End Ave/320 W 66th St's energy grade?
125 West End Ave/320 W 66th St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 32.9 kBtu/ft².
How much energy does 125 West End Ave/320 W 66th St use?
Its 2024 site energy-use intensity was 32.9 kBtu/ft² (71.1 kBtu/ft² source) across 504,664 sq ft, including 2,920,225 kWh of electricity.
What are 125 West End Ave/320 W 66th St's carbon emissions?
125 West End Ave/320 W 66th St reported 1,587 tCO₂e of greenhouse-gas emissions (3.1 kgCO₂e/ft²) for 2024.
Where is 125 West End Ave/320 W 66th St?
125 West End Ave/320 W 66th St is in New York City, New York 10023. Its coordinates are 40.77616, -73.98759 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 125 West End Ave/320 W 66th St and when was it built?
125 West End Ave/320 W 66th St has 504,664 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1984 as its year built. It is classed as office.
Is 125 West End Ave/320 W 66th St 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, “125 West End Ave/320 W 66th St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/125-west-end-ave-320-w-66th-st-9d6ef85a (data as of October 2, 2026).