Westport
Multifamily Housing in New York City, NY · 841 10Th Avenue · 10019
At a glance
Westport is a 365,453-square-foot multifamily housing building at 841 10Th Avenue in New York City, New York, built in 2003. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 5 out of 100 (grade D), a site energy-use intensity of 115.8 kBtu/ft² and 2,974 tCO₂e of greenhouse-gas emissions. That score is higher than 4% 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 | 5 (band D) |
| Site EUI | 115.8 kBtu/ft² |
| Source EUI | 177.7 kBtu/ft² |
| GHG emissions | 2,974 tCO₂e |
| GHG intensity | 8.1 kgCO₂e/ft² |
| Electricity | 3,437,780 kWh |
| Natural gas | 305,854 therms |
| Gross floor area | 365,453 sq ft |
| Source record | nyc:3114508:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 5 | -3 | 115.8 kBtu/ft² | 2,974 tCO₂e |
| 2023 | 8 | +3 | 113.2 kBtu/ft² | 2,746 tCO₂e |
| 2022 | 5 | 129.0 kBtu/ft² | 2,856 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
- 841 10Th Avenue
- City
- New York City
- State
- New York
- ZIP
- 10019
- Coordinates
- 40.76816, -73.98927
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Westport 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. Westport's ENERGY STAR score of 5 compares with an average of 63 across the 22,829 that report a score; it scores higher than 4% of them and lower than 95%. Its site EUI of 115.8 kBtu/ft² is about 55% 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 8.1 kgCO₂e/ft² is about 57% above the group average of 5.2 kgCO₂e/ft².
At 365,453 sq ft, it is about 262% above the average floor area of 100,951 sq ft for those buildings. It was built in 2003, 51 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 Westport's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Westport, covering report years 2022–2024. Its ENERGY STAR score was 5 in both 2022 and 2024. Site EUI moved from 129.0 kBtu/ft² (2022) to 115.8 kBtu/ft² (2024), a 10% decrease. Reported emissions went from 2,856 tCO₂e to 2,974 tCO₂e over the same span (up 4%).
What does an ENERGY STAR score of 5 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 5 means the building performs better than about 5% of its national peers. BuildingCensus bands the score into report-card grades; 5 falls in band D — lowest band (1–54). It sits 70 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. Westport's 115.8 kBtu/ft² across 365,453 sq ft works out to about 42.3 billion Btu (12,403 MWh-equivalent) in 2024. Its source EUI of 177.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,437,780 kWh of electricity and 305,854 therms of natural gas for the year.
Which law requires Westport to report its energy use?
Westport 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:3114508:2024). 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
- 2 Tudor City Tenants Corp. (2 Tudor City Place)· 365,024 sq ft · score 87 (A)
- 180 E End Ave· 364,968 sq ft · score 80 (B)
- Progressive - 2930 West 30th Street· 364,529 sq ft · score 59 (C)
- 105 - 145 W. 168 Street· 364,456 sq ft · score 36 (D)
- 375 - The Solaire· 364,339 sq ft · score 39 (D)
- 81061100 - One Blue Slip· 363,690 sq ft · score 19 (D)
- 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 Westport's energy grade?
Westport scores 5 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Westport use?
Its 2024 site energy-use intensity was 115.8 kBtu/ft² (177.7 kBtu/ft² source) across 365,453 sq ft, including 3,437,780 kWh of electricity and 305,854 therms of natural gas.
What are Westport's carbon emissions?
Westport reported 2,974 tCO₂e of greenhouse-gas emissions (8.1 kgCO₂e/ft²) for 2024.
Where is Westport?
Westport is at 841 10Th Avenue, in New York City, New York 10019. Its coordinates are 40.76816, -73.98927 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Westport and when was it built?
Westport has 365,453 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2003 as its year built. It is classed as multifamily housing.
Is Westport 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, “Westport, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/westport-4431bc81 (data as of October 2, 2026).