Maxwell: 24 East 21st St
Multifamily Housing in New York City, NY · 24 E 21 ST · 10010
At a glance
Maxwell: 24 East 21st St is a 38,895-square-foot multifamily housing building at 24 E 21 ST in New York City, New York, built in 1935. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 95.0 kBtu/ft² and 281 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 95.0 kBtu/ft² |
| Source EUI | 161.4 kBtu/ft² |
| GHG emissions | 281 tCO₂e |
| GHG intensity | 7.2 kgCO₂e/ft² |
| Electricity | 401,862 kWh |
| Natural gas | 23,225 therms |
| Water use | 2,257 kgal |
| Gross floor area | 38,895 sq ft |
| Source record | nyc:6301265:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 95.0 kBtu/ft² | 281 tCO₂e | |
| 2023 | — | 92.8 kBtu/ft² | 263 tCO₂e | |
| 2022 | — | 109.3 kBtu/ft² | 272 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
- 24 E 21 ST
- City
- New York City
- State
- New York
- ZIP
- 10010
- Coordinates
- 40.73965, -73.98910
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Maxwell: 24 East 21st St 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. Its site EUI of 95.0 kBtu/ft² is about 27% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.2 kgCO₂e/ft² is about 39% above the group average of 5.2 kgCO₂e/ft².
At 38,895 sq ft, it is about 61% below the average floor area of 100,951 sq ft for those buildings. It was built in 1935, 17 years earlier 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 Maxwell: 24 East 21st St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Maxwell: 24 East 21st St, covering report years 2022–2024. Site EUI moved from 109.3 kBtu/ft² (2022) to 95.0 kBtu/ft² (2024), a 13% decrease. Reported emissions went from 272 tCO₂e to 281 tCO₂e over the same span (up 3%).
What does a site EUI of 95.0 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. Maxwell: 24 East 21st St's 95.0 kBtu/ft² across 38,895 sq ft works out to about 3.7 billion Btu (1,083 MWh-equivalent) in 2024. Its source EUI of 161.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 401,862 kWh of electricity, 23,225 therms of natural gas and 2,257 thousand gallons of water for the year.
Which law requires Maxwell: 24 East 21st St to report its energy use?
Maxwell: 24 East 21st 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:6301265:2024). 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 multifamily housing buildings in New York City
- 140-71 ASH AVENUE· 38,894 sq ft · score 44 (D)
- B&R: 32-85 33rd St· 38,893 sq ft · score 86 (A)
- MARK BARAKZAI· 38,891 sq ft · score 96 (A)
- 440 West 163rd Street· 38,890 sq ft · score 26 (D)
- 174 Forsyth St· 38,880 sq ft · score 40 (D)
- 34-57 72nd Street· 38,880 sq ft · score 2 (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 Maxwell: 24 East 21st St's energy grade?
Maxwell: 24 East 21st St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 95.0 kBtu/ft².
How much energy does Maxwell: 24 East 21st St use?
Its 2024 site energy-use intensity was 95.0 kBtu/ft² (161.4 kBtu/ft² source) across 38,895 sq ft, including 401,862 kWh of electricity and 23,225 therms of natural gas.
What are Maxwell: 24 East 21st St's carbon emissions?
Maxwell: 24 East 21st St reported 281 tCO₂e of greenhouse-gas emissions (7.2 kgCO₂e/ft²) for 2024.
Where is Maxwell: 24 East 21st St?
Maxwell: 24 East 21st St is at 24 E 21 ST, in New York City, New York 10010. Its coordinates are 40.73965, -73.98910 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Maxwell: 24 East 21st St and when was it built?
Maxwell: 24 East 21st St has 38,895 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1935 as its year built. It is classed as multifamily housing.
Is Maxwell: 24 East 21st 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, “Maxwell: 24 East 21st St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/maxwell-24-east-21st-st-2bed23b1 (data as of October 2, 2026).