400 EAST 66TH ST CO LLC
Multifamily Housing in New York City, NY · 400 EAST 66TH STREET · 10065
At a glance
400 EAST 66TH ST CO LLC is a 140,122-square-foot multifamily housing building at 400 EAST 66TH STREET in New York City, New York, built in 2000. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 42 out of 100 (grade D), a site energy-use intensity of 39.2 kBtu/ft² and 621 tCO₂e of greenhouse-gas emissions. That score is higher than 25% 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 | 42 (band D) |
| Site EUI | 39.2 kBtu/ft² |
| Source EUI | 107.5 kBtu/ft² |
| GHG emissions | 621 tCO₂e |
| GHG intensity | 4.4 kgCO₂e/ft² |
| Electricity | 1,555,945 kWh |
| Natural gas | 1,887 therms |
| Gross floor area | 140,122 sq ft |
| Source record | nyc:2819109:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 42 | ±0 | 39.2 kBtu/ft² | 621 tCO₂e |
| 2023 | 42 | +2 | 38.5 kBtu/ft² | 577 tCO₂e |
| 2022 | 40 | 42.0 kBtu/ft² | 492 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
- 400 EAST 66TH STREET
- City
- New York City
- State
- New York
- ZIP
- 10065
- Coordinates
- 40.76384, -73.95845
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 400 EAST 66TH ST CO LLC 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. 400 EAST 66TH ST CO LLC's ENERGY STAR score of 42 compares with an average of 63 across the 22,829 that report a score; it scores higher than 25% of them and lower than 74%. Its site EUI of 39.2 kBtu/ft² is about half of the average of 74.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.4 kgCO₂e/ft² is about 15% below the group average of 5.2 kgCO₂e/ft².
At 140,122 sq ft, it is about 39% above the average floor area of 100,951 sq ft for those buildings. It was built in 2000, 48 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 400 EAST 66TH ST CO LLC's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 400 EAST 66TH ST CO LLC, covering report years 2022–2024. Its ENERGY STAR score went from 40 in 2022 to 42 in 2024 (+2 points); its best year on file was 2023, at 42. Site EUI moved from 42.0 kBtu/ft² (2022) to 39.2 kBtu/ft² (2024), a 7% decrease. Reported emissions went from 492 tCO₂e to 621 tCO₂e over the same span (up 26%).
What does an ENERGY STAR score of 42 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 42 means the building performs better than about 42% of its national peers. BuildingCensus bands the score into report-card grades; 42 falls in band D — lowest band (1–54). It sits 33 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. 400 EAST 66TH ST CO LLC's 39.2 kBtu/ft² across 140,122 sq ft works out to about 5.5 billion Btu (1,610 MWh-equivalent) in 2024. Its source EUI of 107.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,555,945 kWh of electricity and 1,887 therms of natural gas for the year.
Which law requires 400 EAST 66TH ST CO LLC to report its energy use?
400 EAST 66TH ST CO LLC 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:2819109:2024). 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.
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Frequently asked questions
What is 400 EAST 66TH ST CO LLC's energy grade?
400 EAST 66TH ST CO LLC scores 42 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 400 EAST 66TH ST CO LLC use?
Its 2024 site energy-use intensity was 39.2 kBtu/ft² (107.5 kBtu/ft² source) across 140,122 sq ft, including 1,555,945 kWh of electricity and 1,887 therms of natural gas.
What are 400 EAST 66TH ST CO LLC's carbon emissions?
400 EAST 66TH ST CO LLC reported 621 tCO₂e of greenhouse-gas emissions (4.4 kgCO₂e/ft²) for 2024.
Where is 400 EAST 66TH ST CO LLC?
400 EAST 66TH ST CO LLC is at 400 EAST 66TH STREET, in New York City, New York 10065. Its coordinates are 40.76384, -73.95845 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 400 EAST 66TH ST CO LLC and when was it built?
400 EAST 66TH ST CO LLC has 140,122 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2000 as its year built. It is classed as multifamily housing.
Is 400 EAST 66TH ST CO LLC 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, “400 EAST 66TH ST CO LLC, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/400-east-66th-st-co-llc-d936ae5a (data as of October 2, 2026).