234 Union Avenue
Multifamily Housing in New York City, NY · 234 UNION AVENUE · 11211
At a glance
234 Union Avenue is a 27,000-square-foot multifamily housing building at 234 UNION AVENUE in New York City, New York, built in 1930. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 45 out of 100 (grade D), a site energy-use intensity of 96.3 kBtu/ft² and 179 tCO₂e of greenhouse-gas emissions. That score is higher than 28% 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 | 45 (band D) |
| Site EUI | 96.3 kBtu/ft² |
| Source EUI | 144.0 kBtu/ft² |
| GHG emissions | 179 tCO₂e |
| GHG intensity | 6.6 kgCO₂e/ft² |
| Electricity | 193,758 kWh |
| Natural gas | 19,400 therms |
| Gross floor area | 27,000 sq ft |
| Source record | nyc:52175592:2024 |
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
- 234 UNION AVENUE
- City
- New York City
- State
- New York
- ZIP
- 11211
- Coordinates
- 40.70751, -73.95054
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 234 Union Avenue 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. 234 Union Avenue's ENERGY STAR score of 45 compares with an average of 63 across the 22,829 that report a score; it scores higher than 28% of them and lower than 72%. Its site EUI of 96.3 kBtu/ft² is about 29% 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 6.6 kgCO₂e/ft² is about 27% above the group average of 5.2 kgCO₂e/ft².
At 27,000 sq ft, it is about 73% below the average floor area of 100,951 sq ft for those buildings. It was built in 1930, 22 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.
What does an ENERGY STAR score of 45 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 45 means the building performs better than about 45% of its national peers. BuildingCensus bands the score into report-card grades; 45 falls in band D — lowest band (1–54). It sits 30 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. 234 Union Avenue's 96.3 kBtu/ft² across 27,000 sq ft works out to about 2.6 billion Btu (762 MWh-equivalent) in 2024. Its source EUI of 144.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 193,758 kWh of electricity and 19,400 therms of natural gas for the year.
Which law requires 234 Union Avenue to report its energy use?
234 Union Avenue 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:52175592:2024). 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
- 855 West End Avenue· 26,997 sq ft · score 86 (A)
- Andrews: 267 W 124th St.· 26,996 sq ft · EUI 47.1 kBtu/ft²
- 2031 Webster Avenue· 26,980 sq ft · score 2 (D)
- 201 East 82nd Street· 26,978 sq ft · EUI 166.7 kBtu/ft²
- 511 Evergreen Avenue· 26,976 sq ft · score 96 (A)
- Crown on Oceanview - 524 Ocean View Avenue· 26,971 sq ft · score 99 (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 234 Union Avenue's energy grade?
234 Union Avenue scores 45 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 234 Union Avenue use?
Its 2024 site energy-use intensity was 96.3 kBtu/ft² (144.0 kBtu/ft² source) across 27,000 sq ft, including 193,758 kWh of electricity and 19,400 therms of natural gas.
What are 234 Union Avenue's carbon emissions?
234 Union Avenue reported 179 tCO₂e of greenhouse-gas emissions (6.6 kgCO₂e/ft²) for 2024.
Where is 234 Union Avenue?
234 Union Avenue is at 234 UNION AVENUE, in New York City, New York 11211. Its coordinates are 40.70751, -73.95054 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 234 Union Avenue and when was it built?
234 Union Avenue has 27,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1930 as its year built. It is classed as multifamily housing.
Is 234 Union Avenue 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, “234 Union Avenue, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/234-union-avenue-c3aa82e8 (data as of October 2, 2026).