(4207) - Hardenbrook House Condominium (404 East 66th Street)
Multifamily Housing in New York City, NY · 404 East 66th Street · 10065
At a glance
(4207) - Hardenbrook House Condominium (404 East 66th Street) is a 150,146-square-foot multifamily housing building in New York City, New York, built in 1959. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 73 out of 100 (grade B), a site energy-use intensity of 68.7 kBtu/ft² and 660 tCO₂e of greenhouse-gas emissions. That score is higher than 54% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 73 (band B) |
| Site EUI | 68.7 kBtu/ft² |
| Source EUI | 95.7 kBtu/ft² |
| GHG emissions | 660 tCO₂e |
| GHG intensity | 4.4 kgCO₂e/ft² |
| Electricity | 592,212 kWh |
| Natural gas | 82,897 therms |
| Water use | 4,524 kgal |
| Gross floor area | 150,146 sq ft |
| Source record | nyc:33926605:2023 |
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
- 404 East 66th Street
- City
- New York City
- State
- New York
- ZIP
- 10065
- Coordinates
- 40.76382, -73.95839
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does (4207) - Hardenbrook House Condominium (404 East 66th Street) 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. (4207) - Hardenbrook House Condominium (404 East 66th Street)'s ENERGY STAR score of 73 compares with an average of 63 across the 22,829 that report a score; it scores higher than 54% of them and lower than 44%. Its site EUI of 68.7 kBtu/ft² is roughly in line with 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 150,146 sq ft, it is about 49% above the average floor area of 100,951 sq ft for those buildings. It was built in 1959, 7 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.
What does an ENERGY STAR score of 73 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 73 means the building performs better than about 73% of its national peers. BuildingCensus bands the score into report-card grades; 73 falls in band B — above median (70–84). It sits 2 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. (4207) - Hardenbrook House Condominium (404 East 66th Street)'s 68.7 kBtu/ft² across 150,146 sq ft works out to about 10.3 billion Btu (3,023 MWh-equivalent) in 2023. Its source EUI of 95.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 592,212 kWh of electricity, 82,897 therms of natural gas and 4,524 thousand gallons of water for the year.
Which law requires (4207) - Hardenbrook House Condominium (404 East 66th Street) to report its energy use?
(4207) - Hardenbrook House Condominium (404 East 66th Street) 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 2023 disclosure (source record nyc:33926605:2023). 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
- 1380 Riverside Drive· 150,105 sq ft · score 85 (A)
- 141-131 East 21 Street· 150,086 sq ft · score 73 (B)
- DOUGLASS ADDITION· 150,080 sq ft · score 39 (D)
- 90-19 88th Avenue· 150,000 sq ft
- NB:330 Wythe Avenue· 150,000 sq ft · score 78 (B)
- 907 Fifth Ave· 150,000 sq ft · score 39 (D)
- 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 (4207) - Hardenbrook House Condominium (404 East 66th Street)'s energy grade?
(4207) - Hardenbrook House Condominium (404 East 66th Street) scores 73 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does (4207) - Hardenbrook House Condominium (404 East 66th Street) use?
Its 2023 site energy-use intensity was 68.7 kBtu/ft² (95.7 kBtu/ft² source) across 150,146 sq ft, including 592,212 kWh of electricity and 82,897 therms of natural gas.
What are (4207) - Hardenbrook House Condominium (404 East 66th Street)'s carbon emissions?
(4207) - Hardenbrook House Condominium (404 East 66th Street) reported 660 tCO₂e of greenhouse-gas emissions (4.4 kgCO₂e/ft²) for 2023.
Where is (4207) - Hardenbrook House Condominium (404 East 66th Street)?
(4207) - Hardenbrook House Condominium (404 East 66th Street) is in New York City, New York 10065. Its coordinates are 40.76382, -73.95839 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is (4207) - Hardenbrook House Condominium (404 East 66th Street) and when was it built?
(4207) - Hardenbrook House Condominium (404 East 66th Street) has 150,146 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1959 as its year built. It is classed as multifamily housing.
Is (4207) - Hardenbrook House Condominium (404 East 66th Street) covered by Local Law 84 (LL84)?
Yes — it appears in the 2023 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, “(4207) - Hardenbrook House Condominium (404 East 66th Street), New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/4207-hardenbrook-house-condominium-404-east-66th-street-32d86b98 (data as of October 2, 2026).