NYPL_4617_Muhlenberg Branch Library
Library in New York City, NY · 209 West 23rd St · 10011
At a glance
NYPL_4617_Muhlenberg Branch Library is a 12,953-square-foot library at 209 West 23rd St in New York City, New York, built in 1906. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 58.7 kBtu/ft² and 65 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 58.7 kBtu/ft² |
| Source EUI | 115.8 kBtu/ft² |
| GHG emissions | 65 tCO₂e |
| GHG intensity | 5.0 kgCO₂e/ft² |
| Electricity | 117,573 kWh |
| Natural gas | 3,587 therms |
| Water use | 14 kgal |
| Gross floor area | 12,953 sq ft |
| Source record | nyc:21355488:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 58.7 kBtu/ft² | 65 tCO₂e | |
| 2023 | — | 31.6 kBtu/ft² | 45 tCO₂e | |
| 2022 | — | 59.9 kBtu/ft² | 51 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
- 209 West 23rd St
- City
- New York City
- State
- New York
- ZIP
- 10011
- Coordinates
- 40.74435, -73.99623
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does NYPL_4617_Muhlenberg Branch Library compare with other library buildings in New York City?
The latest disclosures cover 110 library buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 58.7 kBtu/ft² is about 24% below the average of 77.5 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 5.0 kgCO₂e/ft² is about 22% below the group average of 6.5 kgCO₂e/ft².
At 12,953 sq ft, it is about 77% below the average floor area of 55,576 sq ft for those buildings. It was built in 1906, 41 years earlier than the group's average year built (1947).
How has NYPL_4617_Muhlenberg Branch Library's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for NYPL_4617_Muhlenberg Branch Library, covering report years 2022–2024. Site EUI moved from 59.9 kBtu/ft² (2022) to 58.7 kBtu/ft² (2024), a 2% decrease. Reported emissions went from 51 tCO₂e to 65 tCO₂e over the same span (up 28%).
What does a site EUI of 58.7 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. NYPL_4617_Muhlenberg Branch Library's 58.7 kBtu/ft² across 12,953 sq ft works out to about 0.8 billion Btu (223 MWh-equivalent) in 2024. Its source EUI of 115.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 117,573 kWh of electricity, 3,587 therms of natural gas and 14 thousand gallons of water for the year.
Which law requires NYPL_4617_Muhlenberg Branch Library to report its energy use?
NYPL_4617_Muhlenberg Branch Library 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:21355488:2024). 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 library buildings in New York City
- NYPL_9022_Kingsbridge Library· 12,812 sq ft · EUI 120.4 kBtu/ft²
- QPL_4753_Peninsula (ALC) Community Library· 12,750 sq ft · EUI 69.3 kBtu/ft²
- BPL_238_DeKalb Branch Library· 12,584 sq ft · EUI 76.2 kBtu/ft²
- NYPL_4646_Hunt's Point Branch Library· 12,283 sq ft · EUI 0.0 kBtu/ft²
- NYPL_4599_Chatham Square Branch Library· 12,243 sq ft · EUI 91.4 kBtu/ft²
- BPL_234_Coney Island Branch Library and Learning Ctr.· 12,087 sq ft · EUI 68.9 kBtu/ft²
- Library buildings in New York City· 110 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 NYPL_4617_Muhlenberg Branch Library's energy grade?
NYPL_4617_Muhlenberg Branch Library did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 58.7 kBtu/ft².
How much energy does NYPL_4617_Muhlenberg Branch Library use?
Its 2024 site energy-use intensity was 58.7 kBtu/ft² (115.8 kBtu/ft² source) across 12,953 sq ft, including 117,573 kWh of electricity and 3,587 therms of natural gas.
What are NYPL_4617_Muhlenberg Branch Library's carbon emissions?
NYPL_4617_Muhlenberg Branch Library reported 65 tCO₂e of greenhouse-gas emissions (5.0 kgCO₂e/ft²) for 2024.
Where is NYPL_4617_Muhlenberg Branch Library?
NYPL_4617_Muhlenberg Branch Library is at 209 West 23rd St, in New York City, New York 10011. Its coordinates are 40.74435, -73.99623 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is NYPL_4617_Muhlenberg Branch Library and when was it built?
NYPL_4617_Muhlenberg Branch Library has 12,953 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1906 as its year built. It is classed as library.
Is NYPL_4617_Muhlenberg Branch Library 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, “NYPL_4617_Muhlenberg Branch Library, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/nypl-4617-muhlenberg-branch-library-ef1a1b96 (data as of October 2, 2026).