Union Square South
Mixed Use Property in New York City, NY · 1 Union Square South · 10003
At a glance
Union Square South is a 438,548-square-foot mixed use property building at 1 Union Square South in New York City, New York, built in 1998. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 97.9 kBtu/ft² and 4,111 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 97.9 kBtu/ft² |
| Source EUI | 220.7 kBtu/ft² |
| GHG emissions | 4,111 tCO₂e |
| GHG intensity | 9.4 kgCO₂e/ft² |
| Electricity | 8,663,682 kWh |
| Natural gas | 133,524 therms |
| Water use | 14,633 kgal |
| Gross floor area | 438,548 sq ft |
| Source record | nyc:3114481:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 97.9 kBtu/ft² | 4,111 tCO₂e | |
| 2023 | — | 107.8 kBtu/ft² | 4,400 tCO₂e | |
| 2022 | — | 209.5 kBtu/ft² | 6,774 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
- 1 Union Square South
- City
- New York City
- State
- New York
- ZIP
- 10003
- Coordinates
- 40.73398, -73.98990
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Union Square South compare with other mixed use property buildings in New York City?
The latest disclosures cover 395 mixed use property buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 97.9 kBtu/ft² is roughly in line with the average of 92.7 kBtu/ft². Its emissions intensity of 9.4 kgCO₂e/ft² is about 19% above the group average of 7.9 kgCO₂e/ft².
At 438,548 sq ft, it is about twice the average floor area of 224,815 sq ft for those buildings. It was built in 1998, 41 years later than the group's average year built (1958). Across all 24 jurisdictions BuildingCensus covers, the 1,212 mixed use property buildings average an ENERGY STAR score of 69 and a site EUI of 79.8 kBtu/ft².
How has Union Square South's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Union Square South, covering report years 2022–2024. Site EUI moved from 209.5 kBtu/ft² (2022) to 97.9 kBtu/ft² (2024), a 53% decrease. Reported emissions went from 6,774 tCO₂e to 4,111 tCO₂e over the same span (down 39%).
What does a site EUI of 97.9 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. Union Square South's 97.9 kBtu/ft² across 438,548 sq ft works out to about 42.9 billion Btu (12,583 MWh-equivalent) in 2024. Its source EUI of 220.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 8,663,682 kWh of electricity, 133,524 therms of natural gas and 14,633 thousand gallons of water for the year.
Which law requires Union Square South to report its energy use?
Union Square South 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:3114481:2024). 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 mixed use property buildings in New York City
- Feil - 200 East 161st Street· 437,560 sq ft · EUI 52.6 kBtu/ft²
- 49 West 116 st· 432,137 sq ft · score 20 (D)
- Fresh Meadows Place Campus Parent· 420,099 sq ft · EUI 146.5 kBtu/ft²
- Nicotra 1441 South Ave· 416,455 sq ft · EUI 55.0 kBtu/ft²
- Bronx Terminal Market - 610 Exterior St - Retail B/F· 410,046 sq ft · score 37 (D)
- 8-33 40 Ave· 407,140 sq ft · EUI 30.2 kBtu/ft²
- Mixed Use Property buildings in New York City· 395 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 Union Square South's energy grade?
Union Square South did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 97.9 kBtu/ft².
How much energy does Union Square South use?
Its 2024 site energy-use intensity was 97.9 kBtu/ft² (220.7 kBtu/ft² source) across 438,548 sq ft, including 8,663,682 kWh of electricity and 133,524 therms of natural gas.
What are Union Square South's carbon emissions?
Union Square South reported 4,111 tCO₂e of greenhouse-gas emissions (9.4 kgCO₂e/ft²) for 2024.
Where is Union Square South?
Union Square South is at 1 Union Square South, in New York City, New York 10003. Its coordinates are 40.73398, -73.98990 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Union Square South and when was it built?
Union Square South has 438,548 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1998 as its year built. It is classed as mixed use property.
Is Union Square South 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, “Union Square South, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/union-square-south-3c91d7d0 (data as of October 2, 2026).