PENN 1 (LL97)
Office in New York City, NY · 242 WEST 34 STREET · 10119
At a glance
PENN 1 (LL97) is a 2,488,353-square-foot office building at 242 WEST 34 STREET 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 159.7 kBtu/ft² and 26,265 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 159.7 kBtu/ft² |
| Source EUI | 221.8 kBtu/ft² |
| GHG emissions | 26,265 tCO₂e |
| GHG intensity | 10.6 kgCO₂e/ft² |
| Electricity | 21,278,950 kWh |
| Natural gas | 2,755,986 therms |
| Water use | 63,932 kgal |
| Gross floor area | 2,488,353 sq ft |
| Source record | nyc:1272226:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 159.7 kBtu/ft² | 26,265 tCO₂e | |
| 2023 | 65 | ±0 | 131.8 kBtu/ft² | 17,827 tCO₂e |
| 2022 | 65 | 140.4 kBtu/ft² | 19,374 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
- 242 WEST 34 STREET
- City
- New York City
- State
- New York
- ZIP
- 10119
- Coordinates
- 40.75161, -73.99212
Within ~1 km
Nearby benchmarked buildings
- Hudson Yards Cogen Campusscore —
Other · 7,739,076 sq ft
- Manhattan Westscore —
Other · 4,153,954 sq ft
- 20-30 Hudson Yardsscore —
Office · 3,810,623 sq ft
- Penn Southscore 95
Multifamily Housing · 3,391,963 sq ft
- 50 Hudson Yardsscore 76
Office · 2,944,455 sq ft
- ESRT - Empire State Buildingscore 78
Office · 2,852,257 sq ft
See also: most efficient in New York City · biggest emitters
How does PENN 1 (LL97) compare with other office buildings in New York City?
The latest disclosures cover 3,384 office buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 159.7 kBtu/ft² is about 148% above the average of 64.5 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 10.6 kgCO₂e/ft² is about 82% above the group average of 5.8 kgCO₂e/ft².
At 2,488,353 sq ft, it is about 1111% above the average floor area of 205,440 sq ft for those buildings. It was built in 1970, 30 years later than the group's average year built (1940). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has PENN 1 (LL97)'s energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for PENN 1 (LL97), covering report years 2022–2024. Its ENERGY STAR score was 65 in both 2022 and 2023. Site EUI moved from 140.4 kBtu/ft² (2022) to 159.7 kBtu/ft² (2024), an 14% increase. Reported emissions went from 19,374 tCO₂e to 26,265 tCO₂e over the same span (up 36%).
What does a site EUI of 159.7 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. PENN 1 (LL97)'s 159.7 kBtu/ft² across 2,488,353 sq ft works out to about 397.4 billion Btu (116,464 MWh-equivalent) in 2024. Its source EUI of 221.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 21,278,950 kWh of electricity, 2,755,986 therms of natural gas and 63,932 thousand gallons of water for the year.
Which law requires PENN 1 (LL97) to report its energy use?
PENN 1 (LL97) 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:1272226:2024). 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 office buildings in New York City
- PENN 1 (Offices)· 2,439,745 sq ft
- 111 Eighth Avenue· 2,375,706 sq ft · EUI 203.2 kBtu/ft²
- One Liberty Plaza (149 BROADWAY)· 2,346,193 sq ft · score 75 (B)
- 1251 Avenue of the Americas· 2,325,598 sq ft · score 77 (B)
- 3 World Financial Center· 2,288,303 sq ft · score 82 (B)
- 11 Madison Avenue· 2,228,574 sq ft · score 77 (B)
- Office buildings in New York City· 3,384 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 PENN 1 (LL97)'s energy grade?
PENN 1 (LL97) did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 159.7 kBtu/ft².
How much energy does PENN 1 (LL97) use?
Its 2024 site energy-use intensity was 159.7 kBtu/ft² (221.8 kBtu/ft² source) across 2,488,353 sq ft, including 21,278,950 kWh of electricity and 2,755,986 therms of natural gas.
What are PENN 1 (LL97)'s carbon emissions?
PENN 1 (LL97) reported 26,265 tCO₂e of greenhouse-gas emissions (10.6 kgCO₂e/ft²) for 2024.
Where is PENN 1 (LL97)?
PENN 1 (LL97) is at 242 WEST 34 STREET, in New York City, New York 10119. Its coordinates are 40.75161, -73.99212 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is PENN 1 (LL97) and when was it built?
PENN 1 (LL97) has 2,488,353 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1970 as its year built. It is classed as office.
Is PENN 1 (LL97) 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, “PENN 1 (LL97), New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/penn-1-ll97-51ea0060 (data as of October 2, 2026).