124 - Echelon Chelsea
Multifamily Housing in New York City, NY · 37 West 21st Street · 10010
At a glance
124 - Echelon Chelsea is a 156,236-square-foot multifamily housing building at 37 West 21st Street in New York City, New York, built in 2008. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 85 out of 100 (grade A), a site energy-use intensity of 37.0 kBtu/ft² and 505 tCO₂e of greenhouse-gas emissions. That score is higher than 70% 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 | 85 (band A) |
| Site EUI | 37.0 kBtu/ft² |
| Source EUI | 74.6 kBtu/ft² |
| GHG emissions | 505 tCO₂e |
| GHG intensity | 3.2 kgCO₂e/ft² |
| Electricity | 937,349 kWh |
| Natural gas | 25,775 therms |
| Water use | 3,226 kgal |
| Gross floor area | 156,236 sq ft |
| Source record | nyc:2678180:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 85 | ±0 | 37.0 kBtu/ft² | 505 tCO₂e |
| 2023 | 85 | -2 | 35.9 kBtu/ft² | 475 tCO₂e |
| 2022 | 87 | 38.1 kBtu/ft² | 420 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
- 37 West 21st Street
- City
- New York City
- State
- New York
- ZIP
- 10010
- Coordinates
- 40.74082, -73.99182
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 124 - Echelon Chelsea 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. 124 - Echelon Chelsea's ENERGY STAR score of 85 compares with an average of 63 across the 22,829 that report a score; it scores higher than 70% of them and lower than 29%. Its site EUI of 37.0 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 3.2 kgCO₂e/ft² is about 38% below the group average of 5.2 kgCO₂e/ft².
At 156,236 sq ft, it is about 55% above the average floor area of 100,951 sq ft for those buildings. It was built in 2008, 56 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 124 - Echelon Chelsea's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 124 - Echelon Chelsea, covering report years 2022–2024. Its ENERGY STAR score went from 87 in 2022 to 85 in 2024 (-2 points); its best year on file was 2022, at 87. Site EUI moved from 38.1 kBtu/ft² (2022) to 37.0 kBtu/ft² (2024), a 3% decrease. Reported emissions went from 420 tCO₂e to 505 tCO₂e over the same span (up 20%).
What does an ENERGY STAR score of 85 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 85 means the building performs better than about 85% of its national peers. BuildingCensus bands the score into report-card grades; 85 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. 124 - Echelon Chelsea's 37.0 kBtu/ft² across 156,236 sq ft works out to about 5.8 billion Btu (1,694 MWh-equivalent) in 2024. Its source EUI of 74.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 937,349 kWh of electricity, 25,775 therms of natural gas and 3,226 thousand gallons of water for the year.
Which law requires 124 - Echelon Chelsea to report its energy use?
124 - Echelon Chelsea 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:2678180:2024). 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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- Lovett - 123-35 82nd Road· 156,156 sq ft · EUI 75.0 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 124 - Echelon Chelsea's energy grade?
124 - Echelon Chelsea scores 85 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 124 - Echelon Chelsea use?
Its 2024 site energy-use intensity was 37.0 kBtu/ft² (74.6 kBtu/ft² source) across 156,236 sq ft, including 937,349 kWh of electricity and 25,775 therms of natural gas.
What are 124 - Echelon Chelsea's carbon emissions?
124 - Echelon Chelsea reported 505 tCO₂e of greenhouse-gas emissions (3.2 kgCO₂e/ft²) for 2024.
Where is 124 - Echelon Chelsea?
124 - Echelon Chelsea is at 37 West 21st Street, in New York City, New York 10010. Its coordinates are 40.74082, -73.99182 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 124 - Echelon Chelsea and when was it built?
124 - Echelon Chelsea has 156,236 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2008 as its year built. It is classed as multifamily housing.
Is 124 - Echelon Chelsea 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, “124 - Echelon Chelsea, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/124-echelon-chelsea-45485ee1 (data as of October 2, 2026).