15 Union Square West
Multifamily Housing in New York City, NY · 15 UNION SQ. W. · 10003
At a glance
15 Union Square West is a 116,562-square-foot multifamily housing building at 15 UNION SQ. W. in New York City, New York, built in 1900. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 25 out of 100 (grade D), a site energy-use intensity of 99.7 kBtu/ft² and 1,007 tCO₂e of greenhouse-gas emissions. That score is higher than 15% 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 | 25 (band D) |
| Site EUI | 99.7 kBtu/ft² |
| Source EUI | 199.2 kBtu/ft² |
| GHG emissions | 1,007 tCO₂e |
| GHG intensity | 8.6 kgCO₂e/ft² |
| Electricity | 1,844,484 kWh |
| Natural gas | 53,273 therms |
| Water use | 3,711 kgal |
| Gross floor area | 116,562 sq ft |
| Source record | nyc:2669855:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 25 | +23 | 99.7 kBtu/ft² | 1,007 tCO₂e |
| 2023 | 2 | -2 | 113.7 kBtu/ft² | 1,051 tCO₂e |
| 2022 | 4 | 118.5 kBtu/ft² | 900 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
- 15 UNION SQ. W.
- City
- New York City
- State
- New York
- ZIP
- 10003
- Coordinates
- 40.73579, -73.99130
Within ~1 km
Nearby benchmarked buildings
College/University · 7,553,129 sq ft
College/University · 5,000,000 sq ft
- 11 Madison Avenuescore 77
Office · 2,228,574 sq ft
- 51 Madisonscore 79
Office · 1,485,386 sq ft
- One Madison Avenuescore —
Office · 1,339,997 sq ft
- ConEd Irving Placescore 55
Office · 1,255,204 sq ft
See also: most efficient in New York City · biggest emitters
How does 15 Union Square West 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. 15 Union Square West's ENERGY STAR score of 25 compares with an average of 63 across the 22,829 that report a score; it scores higher than 15% of them and lower than 85%. Its site EUI of 99.7 kBtu/ft² is about 33% 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 8.6 kgCO₂e/ft² is about 66% above the group average of 5.2 kgCO₂e/ft².
At 116,562 sq ft, it is about 15% above the average floor area of 100,951 sq ft for those buildings. It was built in 1900, 52 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 15 Union Square West's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 15 Union Square West, covering report years 2022–2024. Its ENERGY STAR score went from 4 in 2022 to 25 in 2024 (+21 points). Site EUI moved from 118.5 kBtu/ft² (2022) to 99.7 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 900 tCO₂e to 1,007 tCO₂e over the same span (up 12%).
What does an ENERGY STAR score of 25 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 25 means the building performs better than about 25% of its national peers. BuildingCensus bands the score into report-card grades; 25 falls in band D — lowest band (1–54). It sits 50 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. 15 Union Square West's 99.7 kBtu/ft² across 116,562 sq ft works out to about 11.6 billion Btu (3,406 MWh-equivalent) in 2024. Its source EUI of 199.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,844,484 kWh of electricity, 53,273 therms of natural gas and 3,711 thousand gallons of water for the year.
Which law requires 15 Union Square West to report its energy use?
15 Union Square West 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:2669855:2024). 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
- 535 4 AVENUE· 116,530 sq ft · score 14 (D)
- M&&L: 51-60 Van Kleeck St· 116,530 sq ft · score 83 (B)
- Stagg Group-739-743 East Gun Hill· 116,515 sq ft · score 100 (A)
- Community Management: 3465/3461 Amboy Road (Parent)· 116,484 sq ft · score 79 (B)
- 222 Johnson Ave· 116,459 sq ft · score 93 (A)
- 222 Johnson Avenue· 116,459 sq ft · score 93 (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 15 Union Square West's energy grade?
15 Union Square West scores 25 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 15 Union Square West use?
Its 2024 site energy-use intensity was 99.7 kBtu/ft² (199.2 kBtu/ft² source) across 116,562 sq ft, including 1,844,484 kWh of electricity and 53,273 therms of natural gas.
What are 15 Union Square West's carbon emissions?
15 Union Square West reported 1,007 tCO₂e of greenhouse-gas emissions (8.6 kgCO₂e/ft²) for 2024.
Where is 15 Union Square West?
15 Union Square West is at 15 UNION SQ. W., in New York City, New York 10003. Its coordinates are 40.73579, -73.99130 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 15 Union Square West and when was it built?
15 Union Square West has 116,562 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1900 as its year built. It is classed as multifamily housing.
Is 15 Union Square West 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).
Working with New York City building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “15 Union Square West, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/15-union-square-west-0b953d23 (data as of October 2, 2026).