351 PROPERTIES LLC
Multifamily Housing in New York City, NY · 351 EAST 21ST STREET · 11226
At a glance
351 PROPERTIES LLC is a 30,240-square-foot multifamily housing building at 351 EAST 21ST STREET in New York City, New York, built in 1925. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 43 out of 100 (grade D), a site energy-use intensity of 83.7 kBtu/ft² and 160 tCO₂e of greenhouse-gas emissions. That score is higher than 26% 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 | 43 (band D) |
| Site EUI | 83.7 kBtu/ft² |
| Source EUI | 111.7 kBtu/ft² |
| GHG emissions | 160 tCO₂e |
| GHG intensity | 5.3 kgCO₂e/ft² |
| Electricity | 120,732 kWh |
| Natural gas | 21,191 therms |
| Gross floor area | 30,240 sq ft |
| Source record | nyc:6444275:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 43 | +3 | 83.7 kBtu/ft² | 160 tCO₂e |
| 2023 | 40 | -12 | 84.3 kBtu/ft² | 158 tCO₂e |
| 2022 | 52 | 85.0 kBtu/ft² | 148 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 351 EAST 21ST STREET
- City
- New York City
- State
- New York
- ZIP
- 11226
- Coordinates
- 40.64572, -73.95911
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 351 PROPERTIES LLC 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. 351 PROPERTIES LLC's ENERGY STAR score of 43 compares with an average of 63 across the 22,829 that report a score; it scores higher than 26% of them and lower than 73%. Its site EUI of 83.7 kBtu/ft² is about 12% 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 5.3 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².
At 30,240 sq ft, it is about 70% below the average floor area of 100,951 sq ft for those buildings. It was built in 1925, 27 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 351 PROPERTIES LLC's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 351 PROPERTIES LLC, covering report years 2022–2024. Its ENERGY STAR score went from 52 in 2022 to 43 in 2024 (-9 points); its best year on file was 2022, at 52. Site EUI moved from 85.0 kBtu/ft² (2022) to 83.7 kBtu/ft² (2024), a 2% decrease. Reported emissions went from 148 tCO₂e to 160 tCO₂e over the same span (up 8%).
What does an ENERGY STAR score of 43 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 43 means the building performs better than about 43% of its national peers. BuildingCensus bands the score into report-card grades; 43 falls in band D — lowest band (1–54). It sits 32 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. 351 PROPERTIES LLC's 83.7 kBtu/ft² across 30,240 sq ft works out to about 2.5 billion Btu (742 MWh-equivalent) in 2024. Its source EUI of 111.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 120,732 kWh of electricity and 21,191 therms of natural gas for the year.
Which law requires 351 PROPERTIES LLC to report its energy use?
351 PROPERTIES LLC 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:6444275:2024). 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
- SLJ:182-12 Horace Haarding· 30,235 sq ft · score 34 (D)
- 173 Harman & 181 Harman Plaza· 30,228 sq ft · score 56 (C)
- ABC: 152 East 35th St· 30,228 sq ft · score 88 (A)
- 036 - 330 East 58th Street· 30,225 sq ft · score 67 (C)
- AKAM - 330 East 58th Street· 30,225 sq ft · score 63 (C)
- 217 Central Park North (215 Cathedral | 215-217 W 110th)· 30,224 sq ft · score 95 (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 351 PROPERTIES LLC's energy grade?
351 PROPERTIES LLC scores 43 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 351 PROPERTIES LLC use?
Its 2024 site energy-use intensity was 83.7 kBtu/ft² (111.7 kBtu/ft² source) across 30,240 sq ft, including 120,732 kWh of electricity and 21,191 therms of natural gas.
What are 351 PROPERTIES LLC's carbon emissions?
351 PROPERTIES LLC reported 160 tCO₂e of greenhouse-gas emissions (5.3 kgCO₂e/ft²) for 2024.
Where is 351 PROPERTIES LLC?
351 PROPERTIES LLC is at 351 EAST 21ST STREET, in New York City, New York 11226. Its coordinates are 40.64572, -73.95911 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 351 PROPERTIES LLC and when was it built?
351 PROPERTIES LLC has 30,240 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1925 as its year built. It is classed as multifamily housing.
Is 351 PROPERTIES LLC 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, “351 PROPERTIES LLC, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/351-properties-llc-4e0341d5 (data as of October 2, 2026).