NYPL_4609_Hudson Park Branch Library
Library in New York City, NY · 66 Leroy St · 10014
At a glance
NYPL_4609_Hudson Park Branch Library is a 15,689-square-foot library at 66 Leroy 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 87.7 kBtu/ft² and 96 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 87.7 kBtu/ft² |
| Source EUI | 134.1 kBtu/ft² |
| GHG emissions | 96 tCO₂e |
| GHG intensity | 6.2 kgCO₂e/ft² |
| Electricity | 110,310 kWh |
| Natural gas | 9,997 therms |
| Gross floor area | 15,689 sq ft |
| Source record | nyc:21355485:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 87.7 kBtu/ft² | 96 tCO₂e | |
| 2023 | — | 71.4 kBtu/ft² | 80 tCO₂e | |
| 2022 | — | 103.0 kBtu/ft² | 100 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 66 Leroy St
- City
- New York City
- State
- New York
- ZIP
- 10014
- Coordinates
- 40.73016, -74.00523
Within ~1 km
Nearby benchmarked buildings
- 550 Washington Streetscore 89
Office · 1,138,018 sq ft
Office · 987,755 sq ft
- 375 Hudson (363 HUDSON STREET)score 92
Office · 885,326 sq ft
Office · 856,538 sq ft
College/University · 760,025 sq ft
- 395 Hudson New York LLCscore 93
Office · 731,175 sq ft
See also: most efficient in New York City · biggest emitters
How does NYPL_4609_Hudson Park 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 87.7 kBtu/ft² is about 13% above the average of 77.5 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.2 kgCO₂e/ft² is roughly in line with the group average of 6.5 kgCO₂e/ft².
At 15,689 sq ft, it is about 72% 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_4609_Hudson Park Branch Library's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for NYPL_4609_Hudson Park Branch Library, covering report years 2022–2024. Site EUI moved from 103.0 kBtu/ft² (2022) to 87.7 kBtu/ft² (2024), a 15% decrease. Reported emissions went from 100 tCO₂e to 96 tCO₂e over the same span (down 3%).
What does a site EUI of 87.7 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_4609_Hudson Park Branch Library's 87.7 kBtu/ft² across 15,689 sq ft works out to about 1.4 billion Btu (403 MWh-equivalent) in 2024. Its source EUI of 134.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 110,310 kWh of electricity and 9,997 therms of natural gas for the year.
Which law requires NYPL_4609_Hudson Park Branch Library to report its energy use?
NYPL_4609_Hudson Park 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:21355485:2024). 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_4661_West Farms Branch Library· 15,591 sq ft · EUI 31.5 kBtu/ft²
- BPL_259_Midwood Branch Library· 15,210 sq ft · EUI 88.8 kBtu/ft²
- BPL_246_Greenpoint Branch Library· 15,000 sq ft · EUI 47.6 kBtu/ft²
- BPL_252_Kings Bay Branch Library· 14,885 sq ft · EUI 64.8 kBtu/ft²
- BPL_230_Carroll Gardens Branch Library· 14,779 sq ft · EUI 56.1 kBtu/ft²
- BPL_272_Stone Avenue Branch Library· 14,258 sq ft · EUI 90.4 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_4609_Hudson Park Branch Library's energy grade?
NYPL_4609_Hudson Park Branch Library did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 87.7 kBtu/ft².
How much energy does NYPL_4609_Hudson Park Branch Library use?
Its 2024 site energy-use intensity was 87.7 kBtu/ft² (134.1 kBtu/ft² source) across 15,689 sq ft, including 110,310 kWh of electricity and 9,997 therms of natural gas.
What are NYPL_4609_Hudson Park Branch Library's carbon emissions?
NYPL_4609_Hudson Park Branch Library reported 96 tCO₂e of greenhouse-gas emissions (6.2 kgCO₂e/ft²) for 2024.
Where is NYPL_4609_Hudson Park Branch Library?
NYPL_4609_Hudson Park Branch Library is at 66 Leroy St, in New York City, New York 10014. Its coordinates are 40.73016, -74.00523 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is NYPL_4609_Hudson Park Branch Library and when was it built?
NYPL_4609_Hudson Park Branch Library has 15,689 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_4609_Hudson Park 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).
Working with New York City building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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_4609_Hudson Park Branch Library, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/nypl-4609-hudson-park-branch-library-14406f83 (data as of October 2, 2026).