135 West 23rd Street
Residential Care Facility in New York City, NY · 10011
At a glance
135 West 23rd Street is a 159,606-square-foot residential care facility 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 79.1 kBtu/ft² and 975 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 79.1 kBtu/ft² |
| Source EUI | 136.8 kBtu/ft² |
| GHG emissions | 975 tCO₂e |
| GHG intensity | 6.1 kgCO₂e/ft² |
| Electricity | 1,437,525 kWh |
| Natural gas | 77,223 therms |
| Water use | 11,755 kgal |
| Gross floor area | 159,606 sq ft |
| Source record | nyc:25745721:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 79.1 kBtu/ft² | 975 tCO₂e | |
| 2023 | — | 82.4 kBtu/ft² | 981 tCO₂e | |
| 2022 | — | 71.7 kBtu/ft² | 765 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
- 135 West 23rd Street
- City
- New York City
- State
- New York
- ZIP
- 10011
- Coordinates
- 40.74339, -73.99392
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 135 West 23rd Street compare with other residential care facility buildings in New York City?
The latest disclosures cover 151 residential care facility buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 79.1 kBtu/ft² is about 29% below the average of 111.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 6.1 kgCO₂e/ft² is about 28% below the group average of 8.5 kgCO₂e/ft².
At 159,606 sq ft, it is about 84% above the average floor area of 86,753 sq ft for those buildings. It was built in 1973, 5 years later than the group's average year built (1968). Across all 24 jurisdictions BuildingCensus covers, the 321 residential care facility buildings average an ENERGY STAR score of 41 and a site EUI of 94.2 kBtu/ft².
How has 135 West 23rd Street's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 135 West 23rd Street, covering report years 2022–2024. Site EUI moved from 71.7 kBtu/ft² (2022) to 79.1 kBtu/ft² (2024), an 10% increase. Reported emissions went from 765 tCO₂e to 975 tCO₂e over the same span (up 27%).
What does a site EUI of 79.1 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. 135 West 23rd Street's 79.1 kBtu/ft² across 159,606 sq ft works out to about 12.6 billion Btu (3,700 MWh-equivalent) in 2024. Its source EUI of 136.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,437,525 kWh of electricity, 77,223 therms of natural gas and 11,755 thousand gallons of water for the year.
Which law requires 135 West 23rd Street to report its energy use?
135 West 23rd 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:25745721:2024). 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 residential care facility buildings in New York City
- 26-13 21st St· 159,582 sq ft · EUI 103.3 kBtu/ft²
- Jacob Reingold Pavilion/ JR· 150,000 sq ft
- 138-49 Elder Avenue· 134,259 sq ft · EUI 68.1 kBtu/ft²
- The Phoenix - 140 Saint Edwards Street· 129,776 sq ft · EUI 137.8 kBtu/ft²
- Phoenix Rehabilitation and Nursing Center· 129,776 sq ft · EUI 161.6 kBtu/ft²
- Richmond Center· 129,333 sq ft
- Residential Care Facility buildings in New York City· 151 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 135 West 23rd Street's energy grade?
135 West 23rd Street did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 79.1 kBtu/ft².
How much energy does 135 West 23rd Street use?
Its 2024 site energy-use intensity was 79.1 kBtu/ft² (136.8 kBtu/ft² source) across 159,606 sq ft, including 1,437,525 kWh of electricity and 77,223 therms of natural gas.
What are 135 West 23rd Street's carbon emissions?
135 West 23rd Street reported 975 tCO₂e of greenhouse-gas emissions (6.1 kgCO₂e/ft²) for 2024.
Where is 135 West 23rd Street?
135 West 23rd Street is in New York City, New York 10011. Its coordinates are 40.74339, -73.99392 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 135 West 23rd Street and when was it built?
135 West 23rd Street has 159,606 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1973 as its year built. It is classed as residential care facility.
Is 135 West 23rd 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, “135 West 23rd Street, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/135-west-23rd-street-344cfdcd (data as of October 2, 2026).