156 William Street
Medical Office in New York City, NY · 156 WILLIAM STREET · 10038
At a glance
156 William Street is a 247,929-square-foot medical office at 156 WILLIAM STREET in New York City, New York, built in 1955. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 57.7 kBtu/ft² and 1,453 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 57.7 kBtu/ft² |
| Source EUI | 135.9 kBtu/ft² |
| GHG emissions | 1,453 tCO₂e |
| GHG intensity | 5.9 kgCO₂e/ft² |
| Electricity | 3,021,503 kWh |
| Water use | 4,146 kgal |
| Gross floor area | 247,929 sq ft |
| Source record | nyc:4327694:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 57.7 kBtu/ft² | 1,453 tCO₂e | |
| 2023 | — | 53.4 kBtu/ft² | 1,302 tCO₂e | |
| 2022 | — | 62.4 kBtu/ft² | 1,227 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
- 156 WILLIAM STREET
- City
- New York City
- State
- New York
- ZIP
- 10038
- Coordinates
- 40.70994, -74.00605
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 156 William Street compare with other medical office buildings in New York City?
The latest disclosures cover 188 medical office buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 57.7 kBtu/ft² is about 41% below the average of 97.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 5.9 kgCO₂e/ft² is about 33% below the group average of 8.8 kgCO₂e/ft².
At 247,929 sq ft, it is about 230% above the average floor area of 75,019 sq ft for those buildings. It was built in 1955, 10 years earlier than the group's average year built (1965). Across all 24 jurisdictions BuildingCensus covers, the 1,266 medical office buildings average an ENERGY STAR score of 64 and a site EUI of 92.2 kBtu/ft².
How has 156 William Street's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 156 William Street, covering report years 2022–2024. Site EUI moved from 62.4 kBtu/ft² (2022) to 57.7 kBtu/ft² (2024), a 8% decrease. Reported emissions went from 1,227 tCO₂e to 1,453 tCO₂e over the same span (up 18%).
What does a site EUI of 57.7 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. 156 William Street's 57.7 kBtu/ft² across 247,929 sq ft works out to about 14.3 billion Btu (4,193 MWh-equivalent) in 2024. Its source EUI of 135.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,021,503 kWh of electricity and 4,146 thousand gallons of water for the year.
Which law requires 156 William Street to report its energy use?
156 William Street 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:4327694:2024). 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 medical office buildings in New York City
- 1650 Selwyn Milstein Building· 243,426 sq ft · score 96 (A)
- 5 East 98th· 238,267 sq ft
- 800 2nd Avenue - data· 231,938 sq ft
- Maimonides - 4813 9th Ave/910 48 Street· 206,714 sq ft · score 68 (C)
- Russ Berrie Pavilion· 195,452 sq ft
- Brooklyn Health Center· 179,000 sq ft
- Medical Office buildings in New York City· 188 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 156 William Street's energy grade?
156 William Street did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 57.7 kBtu/ft².
How much energy does 156 William Street use?
Its 2024 site energy-use intensity was 57.7 kBtu/ft² (135.9 kBtu/ft² source) across 247,929 sq ft, including 3,021,503 kWh of electricity.
What are 156 William Street's carbon emissions?
156 William Street reported 1,453 tCO₂e of greenhouse-gas emissions (5.9 kgCO₂e/ft²) for 2024.
Where is 156 William Street?
156 William Street is at 156 WILLIAM STREET, in New York City, New York 10038. Its coordinates are 40.70994, -74.00605 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 156 William Street and when was it built?
156 William Street has 247,929 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1955 as its year built. It is classed as medical office.
Is 156 William Street 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, “156 William Street, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/156-william-street-bfaf6ca7 (data as of October 2, 2026).