420 E 21st St
Multifamily Housing in New York City, NY · 11226
At a glance
420 E 21st St is a 26,010-square-foot multifamily housing building in New York City, New York, built in 1924. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 5 out of 100 (grade D), a site energy-use intensity of 142.7 kBtu/ft² and 222 tCO₂e of greenhouse-gas emissions. That score is higher than 4% 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 | 5 (band D) |
| Site EUI | 142.7 kBtu/ft² |
| Source EUI | 176.4 kBtu/ft² |
| GHG emissions | 222 tCO₂e |
| GHG intensity | 8.5 kgCO₂e/ft² |
| Electricity | 115,408 kWh |
| Natural gas | 33,184 therms |
| Gross floor area | 26,010 sq ft |
| Source record | nyc:6654607:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 5 | -1 | 142.7 kBtu/ft² | 222 tCO₂e |
| 2023 | 6 | -5 | 139.4 kBtu/ft² | 214 tCO₂e |
| 2022 | 11 | 135.7 kBtu/ft² | 200 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
- 420 E 21st St
- City
- New York City
- State
- New York
- ZIP
- 11226
- Coordinates
- 40.64410, -73.95882
Within ~1 km
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How does 420 E 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. 420 E 21st St's ENERGY STAR score of 5 compares with an average of 63 across the 22,829 that report a score; it scores higher than 4% of them and lower than 95%. Its site EUI of 142.7 kBtu/ft² is about twice 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 8.5 kgCO₂e/ft² is about 64% above the group average of 5.2 kgCO₂e/ft².
At 26,010 sq ft, it is about 74% below the average floor area of 100,951 sq ft for those buildings. It was built in 1924, 28 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 420 E 21st St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 420 E 21st St, covering report years 2022–2024. Its ENERGY STAR score went from 11 in 2022 to 5 in 2024 (-6 points); its best year on file was 2022, at 11. Site EUI moved from 135.7 kBtu/ft² (2022) to 142.7 kBtu/ft² (2024), an 5% increase. Reported emissions went from 200 tCO₂e to 222 tCO₂e over the same span (up 11%).
What does an ENERGY STAR score of 5 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 5 means the building performs better than about 5% of its national peers. BuildingCensus bands the score into report-card grades; 5 falls in band D — lowest band (1–54). It sits 70 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. 420 E 21st St's 142.7 kBtu/ft² across 26,010 sq ft works out to about 3.7 billion Btu (1,088 MWh-equivalent) in 2024. Its source EUI of 176.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 115,408 kWh of electricity and 33,184 therms of natural gas for the year.
Which law requires 420 E 21st St to report its energy use?
420 E 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:6654607:2024). 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
- 433 West 43rd Street· 26,009 sq ft · score 56 (C)
- 423 Ocean Parkway· 26,009 sq ft · EUI 80.5 kBtu/ft²
- 433 West 43rd Street· 26,009 sq ft · score 55 (C)
- 900 Bedford· 26,007 sq ft · EUI 102.7 kBtu/ft²
- 633 W. 171 Street· 26,005 sq ft · score 24 (D)
- 518 West 151st Street· 26,005 sq ft · score 92 (A)
- 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 420 E 21st St's energy grade?
420 E 21st St scores 5 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 420 E 21st St use?
Its 2024 site energy-use intensity was 142.7 kBtu/ft² (176.4 kBtu/ft² source) across 26,010 sq ft, including 115,408 kWh of electricity and 33,184 therms of natural gas.
What are 420 E 21st St's carbon emissions?
420 E 21st St reported 222 tCO₂e of greenhouse-gas emissions (8.5 kgCO₂e/ft²) for 2024.
Where is 420 E 21st St?
420 E 21st St is in New York City, New York 11226. Its coordinates are 40.64410, -73.95882 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 420 E 21st St and when was it built?
420 E 21st St has 26,010 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1924 as its year built. It is classed as multifamily housing.
Is 420 E 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, “420 E 21st St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/420-e-21st-st-92861d5e (data as of October 2, 2026).