UNITY PLAZA (SITES 4-27) - 340 Williams Ave
Multifamily Housing in New York City, NY · 340 WILLIAMS AVENUE · 11207
At a glance
UNITY PLAZA (SITES 4-27) - 340 Williams Ave is a 85,932-square-foot multifamily housing building at 340 WILLIAMS AVENUE in New York City, New York, built in 1973. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 11.6 kBtu/ft² and 115 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 11.6 kBtu/ft² |
| Source EUI | 32.4 kBtu/ft² |
| GHG emissions | 115 tCO₂e |
| GHG intensity | 1.3 kgCO₂e/ft² |
| Electricity | 291,657 kWh |
| Gross floor area | 85,932 sq ft |
| Source record | nyc:21545684:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 11.6 kBtu/ft² | 115 tCO₂e | |
| 2023 | — | 10.8 kBtu/ft² | 101 tCO₂e | |
| 2022 | — | — | 0 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
- 340 WILLIAMS AVENUE
- City
- New York City
- State
- New York
- ZIP
- 11207
- Coordinates
- 40.66767, -73.89866
Within ~1 km
Nearby benchmarked buildings
- VAN DYKE I/VAN DYKE IIscore 9
Multifamily Housing · 1,717,250 sq ft
- VAN DYKE Iscore —
Multifamily Housing · 1,575,450 sq ft
- GLENMORE PLAZA Bldgs 2-4score —
Multifamily Housing · 991,000 sq ft
Multifamily Housing · 944,590 sq ft
Multifamily Housing · 944,590 sq ft
- LOW HOUSES Bldgs 1-3score —
Multifamily Housing · 541,000 sq ft
See also: most efficient in New York City · biggest emitters
How does UNITY PLAZA (SITES 4-27) - 340 Williams Ave 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 11.6 kBtu/ft² is about 85% below the average of 74.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 1.3 kgCO₂e/ft² is about 74% below the group average of 5.2 kgCO₂e/ft².
At 85,932 sq ft, it is about 15% below the average floor area of 100,951 sq ft for those buildings. It was built in 1973, 21 years later 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 UNITY PLAZA (SITES 4-27) - 340 Williams Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for UNITY PLAZA (SITES 4-27) - 340 Williams Ave, covering report years 2022–2024. Site EUI moved from 10.8 kBtu/ft² (2023) to 11.6 kBtu/ft² (2024), an 7% increase.
What does a site EUI of 11.6 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. UNITY PLAZA (SITES 4-27) - 340 Williams Ave's 11.6 kBtu/ft² across 85,932 sq ft works out to about 1 billion Btu (292 MWh-equivalent) in 2024. Its source EUI of 32.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 291,657 kWh of electricity for the year.
Which law requires UNITY PLAZA (SITES 4-27) - 340 Williams Ave to report its energy use?
UNITY PLAZA (SITES 4-27) - 340 Williams Ave 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:21545684:2024). 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
- Camelot· 85,908 sq ft · score 62 (C)
- Chestnut - 1200 College Avenue· 85,904 sq ft · score 59 (C)
- Orsid - 310 West End Avenue· 85,836 sq ft · score 95 (A)
- (05310) - 310 West End Avenue Owners Corp. (310 West End Ave)· 85,836 sq ft · score 98 (A)
- 720 Riverside Drive· 85,836 sq ft · score 74 (B)
- CQ- 439 Beach 22nd Street· 85,814 sq ft · score 40 (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 UNITY PLAZA (SITES 4-27) - 340 Williams Ave's energy grade?
UNITY PLAZA (SITES 4-27) - 340 Williams Ave did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 11.6 kBtu/ft².
How much energy does UNITY PLAZA (SITES 4-27) - 340 Williams Ave use?
Its 2024 site energy-use intensity was 11.6 kBtu/ft² (32.4 kBtu/ft² source) across 85,932 sq ft, including 291,657 kWh of electricity.
What are UNITY PLAZA (SITES 4-27) - 340 Williams Ave's carbon emissions?
UNITY PLAZA (SITES 4-27) - 340 Williams Ave reported 115 tCO₂e of greenhouse-gas emissions (1.3 kgCO₂e/ft²) for 2024.
Where is UNITY PLAZA (SITES 4-27) - 340 Williams Ave?
UNITY PLAZA (SITES 4-27) - 340 Williams Ave is at 340 WILLIAMS AVENUE, in New York City, New York 11207. Its coordinates are 40.66767, -73.89866 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is UNITY PLAZA (SITES 4-27) - 340 Williams Ave and when was it built?
UNITY PLAZA (SITES 4-27) - 340 Williams Ave has 85,932 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1973 as its year built. It is classed as multifamily housing.
Is UNITY PLAZA (SITES 4-27) - 340 Williams Ave 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, “UNITY PLAZA (SITES 4-27) - 340 Williams Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/unity-plaza-sites-4-27-340-williams-ave-ee3af177 (data as of October 2, 2026).