523 W 135th St
Multifamily Housing in New York City, NY · 523 West 135th Street · 10031
At a glance
523 W 135th St is a 13,770-square-foot multifamily housing building at 523 West 135th Street in New York City, New York, built in 1910. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 50 out of 100 (grade D), a site energy-use intensity of 118.0 kBtu/ft² and 101 tCO₂e of greenhouse-gas emissions. That score is higher than 32% 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 | 50 (band D) |
| Site EUI | 118.0 kBtu/ft² |
| Source EUI | 157.2 kBtu/ft² |
| GHG emissions | 101 tCO₂e |
| GHG intensity | 7.3 kgCO₂e/ft² |
| Electricity | 76,988 kWh |
| Natural gas | 13,617 therms |
| Gross floor area | 13,770 sq ft |
| Source record | nyc:9997481:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 50 | -26 | 118.0 kBtu/ft² | 101 tCO₂e |
| 2022 | 76 | 95.5 kBtu/ft² | 79 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
- 523 West 135th Street
- City
- New York City
- State
- New York
- ZIP
- 10031
- Coordinates
- 40.81930, -73.95304
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 523 W 135th St 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. 523 W 135th St's ENERGY STAR score of 50 compares with an average of 63 across the 22,829 that report a score; it scores higher than 32% of them and lower than 68%. Its site EUI of 118.0 kBtu/ft² is about 58% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.3 kgCO₂e/ft² is about 40% above the group average of 5.2 kgCO₂e/ft².
At 13,770 sq ft, it is about 86% below the average floor area of 100,951 sq ft for those buildings. It was built in 1910, 42 years earlier 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 523 W 135th St's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 523 W 135th St, covering report years 2022–2023. Its ENERGY STAR score went from 76 in 2022 to 50 in 2023 (-26 points); its best year on file was 2022, at 76. Site EUI moved from 95.5 kBtu/ft² (2022) to 118.0 kBtu/ft² (2023), an 24% increase. Reported emissions went from 79 tCO₂e to 101 tCO₂e over the same span (up 28%).
What does an ENERGY STAR score of 50 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 50 means the building performs better than about 50% of its national peers. BuildingCensus bands the score into report-card grades; 50 falls in band D — lowest band (1–54). It sits 25 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. 523 W 135th St's 118.0 kBtu/ft² across 13,770 sq ft works out to about 1.6 billion Btu (476 MWh-equivalent) in 2023. Its source EUI of 157.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 76,988 kWh of electricity and 13,617 therms of natural gas for the year.
Which law requires 523 W 135th St to report its energy use?
523 W 135th St 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:9997481:2023). 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.
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- Multifamily Housing buildings in New York City· 33,022 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
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Frequently asked questions
What is 523 W 135th St's energy grade?
523 W 135th St scores 50 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 523 W 135th St use?
Its 2023 site energy-use intensity was 118.0 kBtu/ft² (157.2 kBtu/ft² source) across 13,770 sq ft, including 76,988 kWh of electricity and 13,617 therms of natural gas.
What are 523 W 135th St's carbon emissions?
523 W 135th St reported 101 tCO₂e of greenhouse-gas emissions (7.3 kgCO₂e/ft²) for 2023.
Where is 523 W 135th St?
523 W 135th St is at 523 West 135th Street, in New York City, New York 10031. Its coordinates are 40.81930, -73.95304 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 523 W 135th St and when was it built?
523 W 135th St has 13,770 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1910 as its year built. It is classed as multifamily housing.
Is 523 W 135th St 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, “523 W 135th St, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/523-w-135th-st-e373726d (data as of October 2, 2026).