421 WEST 35th STREET
Multifamily Housing in New York City, NY · 10001
At a glance
421 WEST 35th STREET is a 178,414-square-foot multifamily housing building in New York City, New York, built in 2015. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 62 out of 100 (grade C), a site energy-use intensity of 56.5 kBtu/ft² and 774 tCO₂e of greenhouse-gas emissions. That score is higher than 42% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 62 (band C) |
| Site EUI | 56.5 kBtu/ft² |
| Source EUI | 101.4 kBtu/ft² |
| GHG emissions | 774 tCO₂e |
| GHG intensity | 4.3 kgCO₂e/ft² |
| Electricity | 1,254,922 kWh |
| Natural gas | 58,042 therms |
| Water use | 4,499 kgal |
| Gross floor area | 178,414 sq ft |
| Source record | nyc:26591646:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 62 | +6 | 56.5 kBtu/ft² | 774 tCO₂e |
| 2022 | 56 | 69.8 kBtu/ft² | 776 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
- 421 WEST 35th STREET
- City
- New York City
- State
- New York
- ZIP
- 10001
- Coordinates
- 40.75445, -73.99671
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
- The Spiral - 66 Hudson Boulevardscore 82
Office · 2,830,000 sq ft
See also: most efficient in New York City · biggest emitters
How does 421 WEST 35th STREET compare with other multifamily housing buildings in New York City?
The latest disclosures cover 33,022 multifamily housing buildings in New York City, out of 48,310 buildings citywide. 421 WEST 35th STREET's ENERGY STAR score of 62 compares with an average of 63 across the 22,829 that report a score; it scores higher than 42% of them and lower than 57%. Its site EUI of 56.5 kBtu/ft² is about 25% below the average of 74.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.3 kgCO₂e/ft² is about 17% below the group average of 5.2 kgCO₂e/ft².
At 178,414 sq ft, it is about 77% above the average floor area of 100,951 sq ft for those buildings. It was built in 2015, 63 years later than the group's average year built (1952). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has 421 WEST 35th STREET's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 421 WEST 35th STREET, covering report years 2022–2023. Its ENERGY STAR score went from 56 in 2022 to 62 in 2023 (+6 points). Site EUI moved from 69.8 kBtu/ft² (2022) to 56.5 kBtu/ft² (2023), a 19% decrease. Reported emissions went from 776 tCO₂e to 774 tCO₂e over the same span (down 0%).
What does an ENERGY STAR score of 62 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 62 means the building performs better than about 62% of its national peers. BuildingCensus bands the score into report-card grades; 62 falls in band C — below median (55–69). It sits 13 points below 75, the threshold for ENERGY STAR certification. In New York City, 43% of scored buildings are at 75 or above.
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. 421 WEST 35th STREET's 56.5 kBtu/ft² across 178,414 sq ft works out to about 10.1 billion Btu (2,954 MWh-equivalent) in 2023. Its source EUI of 101.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,254,922 kWh of electricity, 58,042 therms of natural gas and 4,499 thousand gallons of water for the year.
Which law requires 421 WEST 35th STREET to report its energy use?
421 WEST 35th 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 2023 disclosure (source record nyc:26591646:2023). 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 multifamily housing buildings in New York City
- Seward Park Extension - Bldg 2· 178,344 sq ft · EUI 136.9 kBtu/ft²
- Centria (18 West 48th Street)· 178,328 sq ft · score 42 (D)
- 27-40 Hoyt Avenue South· 178,312 sq ft · score 90 (A)
- AKAM - 440 West End Avenue· 178,311 sq ft · score 89 (A)
- AUDUBON· 178,300 sq ft · score 1 (D)
- Wavecrest CHILD - 951 Hoe Avenue· 178,296 sq ft
- Multifamily Housing buildings in New York City· 33,022 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 421 WEST 35th STREET's energy grade?
421 WEST 35th STREET scores 62 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 421 WEST 35th STREET use?
Its 2023 site energy-use intensity was 56.5 kBtu/ft² (101.4 kBtu/ft² source) across 178,414 sq ft, including 1,254,922 kWh of electricity and 58,042 therms of natural gas.
What are 421 WEST 35th STREET's carbon emissions?
421 WEST 35th STREET reported 774 tCO₂e of greenhouse-gas emissions (4.3 kgCO₂e/ft²) for 2023.
Where is 421 WEST 35th STREET?
421 WEST 35th STREET is in New York City, New York 10001. Its coordinates are 40.75445, -73.99671 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 421 WEST 35th STREET and when was it built?
421 WEST 35th STREET has 178,414 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2015 as its year built. It is classed as multifamily housing.
Is 421 WEST 35th STREET covered by Local Law 84 (LL84)?
Yes — it appears in the 2023 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, “421 WEST 35th STREET, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/421-west-35th-street-f1dc12ca (data as of October 2, 2026).