WINDSOR COURT
Multifamily Housing in New York City, NY · 151 E. 31St Street · 10016
At a glance
WINDSOR COURT is a 838,398-square-foot multifamily housing building at 151 E. 31St Street in New York City, New York, built in 1987. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 63 out of 100 (grade C), a site energy-use intensity of 83.7 kBtu/ft² and 5,346 tCO₂e of greenhouse-gas emissions. That score is higher than 43% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 63 (band C) |
| Site EUI | 83.7 kBtu/ft² |
| Source EUI | 142.4 kBtu/ft² |
| GHG emissions | 5,346 tCO₂e |
| GHG intensity | 6.4 kgCO₂e/ft² |
| Electricity | 7,654,558 kWh |
| Natural gas | 440,545 therms |
| Water use | 37,442 kgal |
| Gross floor area | 838,398 sq ft |
| Source record | nyc:4398348:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 63 | -28 | 83.7 kBtu/ft² | 5,346 tCO₂e |
| 2023 | 91 | +36 | 82.0 kBtu/ft² | 4,979 tCO₂e |
| 2022 | 55 | 84.2 kBtu/ft² | 4,702 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
- 151 E. 31St Street
- City
- New York City
- State
- New York
- ZIP
- 10016
- Coordinates
- 40.74429, -73.98058
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does WINDSOR COURT 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. WINDSOR COURT's ENERGY STAR score of 63 compares with an average of 63 across the 22,829 that report a score; it scores higher than 43% of them and lower than 56%. Its site EUI of 83.7 kBtu/ft² is about 12% 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 6.4 kgCO₂e/ft² is about 23% above the group average of 5.2 kgCO₂e/ft².
At 838,398 sq ft, it is about 731% above the average floor area of 100,951 sq ft for those buildings. It was built in 1987, 35 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 WINDSOR COURT's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for WINDSOR COURT, covering report years 2022–2024. Its ENERGY STAR score went from 55 in 2022 to 63 in 2024 (+8 points); its best year on file was 2023, at 91. Site EUI moved from 84.2 kBtu/ft² (2022) to 83.7 kBtu/ft² (2024), a 1% decrease. Reported emissions went from 4,702 tCO₂e to 5,346 tCO₂e over the same span (up 14%).
What does an ENERGY STAR score of 63 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 63 means the building performs better than about 63% of its national peers. BuildingCensus bands the score into report-card grades; 63 falls in band C — below median (55–69). It sits 12 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. WINDSOR COURT's 83.7 kBtu/ft² across 838,398 sq ft works out to about 70.2 billion Btu (20,566 MWh-equivalent) in 2024. Its source EUI of 142.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 7,654,558 kWh of electricity, 440,545 therms of natural gas and 37,442 thousand gallons of water for the year.
Which law requires WINDSOR COURT to report its energy use?
WINDSOR COURT 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:4398348:2024). 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 multifamily housing buildings in New York City
- KINGSBOROUGH· 838,000 sq ft · EUI 30.7 kBtu/ft²
- PARKSIDE· 837,200 sq ft · score 10 (D)
- Castle Village Owners Corporation (110-200 Cabrini Blvd.) (Campus)· 836,252 sq ft · score 100 (A)
- EASTCHESTER GARDENS· 835,395 sq ft · score 42 (D)
- View 34· 835,279 sq ft · score 58 (C)
- 20 Exchange Place· 834,678 sq ft · score 67 (C)
- 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 WINDSOR COURT's energy grade?
WINDSOR COURT scores 63 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does WINDSOR COURT use?
Its 2024 site energy-use intensity was 83.7 kBtu/ft² (142.4 kBtu/ft² source) across 838,398 sq ft, including 7,654,558 kWh of electricity and 440,545 therms of natural gas.
What are WINDSOR COURT's carbon emissions?
WINDSOR COURT reported 5,346 tCO₂e of greenhouse-gas emissions (6.4 kgCO₂e/ft²) for 2024.
Where is WINDSOR COURT?
WINDSOR COURT is at 151 E. 31St Street, in New York City, New York 10016. Its coordinates are 40.74429, -73.98058 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is WINDSOR COURT and when was it built?
WINDSOR COURT has 838,398 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1987 as its year built. It is classed as multifamily housing.
Is WINDSOR COURT 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, “WINDSOR COURT, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/windsor-court-3f7ab7f1 (data as of October 2, 2026).