Chelsea Operating Inc - 521 West 21 st
Retail Store in New York City, NY · 521 West 21 st · 10011
At a glance
Chelsea Operating Inc - 521 West 21 st is a 34,600-square-foot retail store in New York City, New York, built in 1931. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 55.4 kBtu/ft² and 170 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 55.4 kBtu/ft² |
| Source EUI | 113.7 kBtu/ft² |
| GHG emissions | 170 tCO₂e |
| GHG intensity | 4.9 kgCO₂e/ft² |
| Electricity | 322,287 kWh |
| Natural gas | 8,157 therms |
| Water use | 116 kgal |
| Gross floor area | 34,600 sq ft |
| Source record | nyc:6778499:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 55.4 kBtu/ft² | 170 tCO₂e | |
| 2023 | — | 49.1 kBtu/ft² | 146 tCO₂e | |
| 2022 | — | 57.9 kBtu/ft² | 143 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
- 521 West 21 st
- City
- New York City
- State
- New York
- ZIP
- 10011
- Coordinates
- 40.74685, -74.00614
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Chelsea Operating Inc - 521 West 21 st compare with other retail store buildings in New York City?
The latest disclosures cover 525 retail store buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 55.4 kBtu/ft² is about 26% below the average of 75.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.9 kgCO₂e/ft² is about 24% below the group average of 6.5 kgCO₂e/ft².
At 34,600 sq ft, it is about 58% below the average floor area of 81,524 sq ft for those buildings. It was built in 1931, 31 years earlier than the group's average year built (1963). Across all 24 jurisdictions BuildingCensus covers, the 3,025 retail store buildings average an ENERGY STAR score of 73 and a site EUI of 57.7 kBtu/ft².
How has Chelsea Operating Inc - 521 West 21 st's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Chelsea Operating Inc - 521 West 21 st, covering report years 2022–2024. Site EUI moved from 57.9 kBtu/ft² (2022) to 55.4 kBtu/ft² (2024), a 4% decrease. Reported emissions went from 143 tCO₂e to 170 tCO₂e over the same span (up 19%).
What does a site EUI of 55.4 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. Chelsea Operating Inc - 521 West 21 st's 55.4 kBtu/ft² across 34,600 sq ft works out to about 1.9 billion Btu (562 MWh-equivalent) in 2024. Its source EUI of 113.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 322,287 kWh of electricity, 8,157 therms of natural gas and 116 thousand gallons of water for the year.
Which law requires Chelsea Operating Inc - 521 West 21 st to report its energy use?
Chelsea Operating Inc - 521 West 21 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:6778499:2024). 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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- ISLAND CONDO MGMT CORP:655 ROSSVILLE AVENUE· 34,349 sq ft · score 1 (D)
- 71-25 Kissena Boulevard· 34,340 sq ft · EUI 166.7 kBtu/ft²
- 144-01 Northern Blvd· 34,183 sq ft
- NYNEW YORK555 FIFTH AVE (BN 2234)· 34,137 sq ft
- 2294 Nostrand Avenue (Parent Property)· 34,121 sq ft · EUI 72.6 kBtu/ft²
- Retail Store buildings in New York City· 525 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 Chelsea Operating Inc - 521 West 21 st's energy grade?
Chelsea Operating Inc - 521 West 21 st did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 55.4 kBtu/ft².
How much energy does Chelsea Operating Inc - 521 West 21 st use?
Its 2024 site energy-use intensity was 55.4 kBtu/ft² (113.7 kBtu/ft² source) across 34,600 sq ft, including 322,287 kWh of electricity and 8,157 therms of natural gas.
What are Chelsea Operating Inc - 521 West 21 st's carbon emissions?
Chelsea Operating Inc - 521 West 21 st reported 170 tCO₂e of greenhouse-gas emissions (4.9 kgCO₂e/ft²) for 2024.
Where is Chelsea Operating Inc - 521 West 21 st?
Chelsea Operating Inc - 521 West 21 st is in New York City, New York 10011. Its coordinates are 40.74685, -74.00614 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Chelsea Operating Inc - 521 West 21 st and when was it built?
Chelsea Operating Inc - 521 West 21 st has 34,600 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1931 as its year built. It is classed as retail store.
Is Chelsea Operating Inc - 521 West 21 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, “Chelsea Operating Inc - 521 West 21 st, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/chelsea-operating-inc-521-west-21-st-2c2a39e7 (data as of October 2, 2026).