Mutual Redevelopment -Commercial Building #3
Medical Office in New York City, NY · 309 West 23rd St · 10001
At a glance
Mutual Redevelopment -Commercial Building #3 is a 25,929-square-foot medical office at 309 West 23rd St in New York City, New York, built in 1970. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 292.0 kBtu/ft² and 614 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 292.0 kBtu/ft² |
| Source EUI | 537.8 kBtu/ft² |
| GHG emissions | 614 tCO₂e |
| GHG intensity | 23.7 kgCO₂e/ft² |
| Electricity | 1,004,107 kWh |
| Natural gas | 41,442 therms |
| Gross floor area | 25,929 sq ft |
| Source record | nyc:2688352:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 292.0 kBtu/ft² | 614 tCO₂e | |
| 2023 | — | 302.2 kBtu/ft² | 613 tCO₂e | |
| 2022 | — | 15.9 kBtu/ft² | 22 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
- 309 West 23rd St
- City
- New York City
- State
- New York
- ZIP
- 10001
- Coordinates
- 40.74555, -73.99907
Within ~1 km
Nearby benchmarked buildings
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- PENN 1 (LL97)score —
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- PENN 1 (Offices)score —
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- 111 Eighth Avenuescore —
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See also: most efficient in New York City · biggest emitters
How does Mutual Redevelopment -Commercial Building #3 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 292.0 kBtu/ft² is about 199% above the average of 97.6 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 23.7 kgCO₂e/ft² is about 169% above the group average of 8.8 kgCO₂e/ft².
At 25,929 sq ft, it is about 65% below the average floor area of 75,019 sq ft for those buildings. It was built in 1970, 5 years later 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 Mutual Redevelopment -Commercial Building #3's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Mutual Redevelopment -Commercial Building #3, covering report years 2022–2024. Site EUI moved from 15.9 kBtu/ft² (2022) to 292.0 kBtu/ft² (2024), an 1736% increase. Reported emissions went from 22 tCO₂e to 614 tCO₂e over the same span (up 2706%).
What does a site EUI of 292.0 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. Mutual Redevelopment -Commercial Building #3's 292.0 kBtu/ft² across 25,929 sq ft works out to about 7.6 billion Btu (2,219 MWh-equivalent) in 2024. Its source EUI of 537.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,004,107 kWh of electricity and 41,442 therms of natural gas for the year.
Which law requires Mutual Redevelopment -Commercial Building #3 to report its energy use?
Mutual Redevelopment -Commercial Building #3 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:2688352:2024). 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
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- Canal Holding· 25,484 sq ft · score 6 (D)
- 2020 Coney Island Avenue· 25,060 sq ft · score 78 (B)
- Centerlight Building· 24,952 sq ft · score 35 (D)
- 716RR Substance Abuse Treatment Residential· 22,387 sq ft · score 79 (B)
- COE Property Management:727 OCEAN VIEW AVENUE· 21,444 sq ft · score 97 (A)
- 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 Mutual Redevelopment -Commercial Building #3's energy grade?
Mutual Redevelopment -Commercial Building #3 did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 292.0 kBtu/ft².
How much energy does Mutual Redevelopment -Commercial Building #3 use?
Its 2024 site energy-use intensity was 292.0 kBtu/ft² (537.8 kBtu/ft² source) across 25,929 sq ft, including 1,004,107 kWh of electricity and 41,442 therms of natural gas.
What are Mutual Redevelopment -Commercial Building #3's carbon emissions?
Mutual Redevelopment -Commercial Building #3 reported 614 tCO₂e of greenhouse-gas emissions (23.7 kgCO₂e/ft²) for 2024.
Where is Mutual Redevelopment -Commercial Building #3?
Mutual Redevelopment -Commercial Building #3 is at 309 West 23rd St, in New York City, New York 10001. Its coordinates are 40.74555, -73.99907 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Mutual Redevelopment -Commercial Building #3 and when was it built?
Mutual Redevelopment -Commercial Building #3 has 25,929 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1970 as its year built. It is classed as medical office.
Is Mutual Redevelopment -Commercial Building #3 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, “Mutual Redevelopment -Commercial Building #3, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/mutual-redevelopment-commercial-building-3-fd26465e (data as of October 2, 2026).