840 Westchester Ave
Mixed Use Property in New York City, NY · 10459
At a glance
840 Westchester Ave is a 62,030-square-foot mixed use property building in New York City, New York, built in 2007. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 88 out of 100 (grade A), a site energy-use intensity of 62.7 kBtu/ft² and 394 tCO₂e of greenhouse-gas emissions. That score is higher than 86% of the 35 scored mixed use property buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 88 (band A) |
| Site EUI | 62.7 kBtu/ft² |
| Source EUI | 161.1 kBtu/ft² |
| GHG emissions | 394 tCO₂e |
| GHG intensity | 6.4 kgCO₂e/ft² |
| Electricity | 990,140 kWh |
| Natural gas | 5,107 therms |
| Water use | 630 kgal |
| Gross floor area | 62,030 sq ft |
| Source record | nyc:7440873:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 88 | +10 | 62.7 kBtu/ft² | 394 tCO₂e |
| 2022 | 78 | 73.3 kBtu/ft² | 367 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
- 840 Westchester Ave
- City
- New York City
- State
- New York
- ZIP
- 10459
- Coordinates
- 40.81974, -73.90148
Within ~1 km
Nearby benchmarked buildings
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- MCKINLEYscore 99
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Multifamily Housing · 344,470 sq ft
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See also: most efficient in New York City · biggest emitters
How does 840 Westchester Ave compare with other mixed use property buildings in New York City?
The latest disclosures cover 395 mixed use property buildings in New York City, out of 48,310 buildings citywide. 840 Westchester Ave's ENERGY STAR score of 88 compares with an average of 53 across the 35 that report a score; it scores higher than 86% of them and lower than 11%. Its site EUI of 62.7 kBtu/ft² is about 32% below the average of 92.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 6.4 kgCO₂e/ft² is about 19% below the group average of 7.9 kgCO₂e/ft².
At 62,030 sq ft, it is about 72% below the average floor area of 224,815 sq ft for those buildings. It was built in 2007, 50 years later than the group's average year built (1958). Across all 24 jurisdictions BuildingCensus covers, the 1,212 mixed use property buildings average an ENERGY STAR score of 69 and a site EUI of 79.8 kBtu/ft².
How has 840 Westchester Ave's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 840 Westchester Ave, covering report years 2022–2023. Its ENERGY STAR score went from 78 in 2022 to 88 in 2023 (+10 points). Site EUI moved from 73.3 kBtu/ft² (2022) to 62.7 kBtu/ft² (2023), a 14% decrease. Reported emissions went from 367 tCO₂e to 394 tCO₂e over the same span (up 7%).
What does an ENERGY STAR score of 88 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 88 means the building performs better than about 88% of its national peers. BuildingCensus bands the score into report-card grades; 88 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. 840 Westchester Ave's 62.7 kBtu/ft² across 62,030 sq ft works out to about 3.9 billion Btu (1,140 MWh-equivalent) in 2023. Its source EUI of 161.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 990,140 kWh of electricity, 5,107 therms of natural gas and 630 thousand gallons of water for the year.
Which law requires 840 Westchester Ave to report its energy use?
840 Westchester Ave 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:7440873:2023). 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 mixed use property buildings in New York City
- 31 - Our Lady of Mt Carmel - Parent Property· 61,978 sq ft · EUI 37.1 kBtu/ft²
- Rego Tower 64th Road Condominium· 60,283 sq ft
- 22 Mercer Street - data· 59,244 sq ft · EUI 60.4 kBtu/ft²
- 5923 Strickland Avenue· 59,200 sq ft · score 90 (A)
- Faculty/Presidents House· 58,273 sq ft · EUI 219.2 kBtu/ft²
- Washington Court - data· 57,826 sq ft · EUI 92.6 kBtu/ft²
- Mixed Use Property buildings in New York City· 395 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 840 Westchester Ave's energy grade?
840 Westchester Ave scores 88 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 840 Westchester Ave use?
Its 2023 site energy-use intensity was 62.7 kBtu/ft² (161.1 kBtu/ft² source) across 62,030 sq ft, including 990,140 kWh of electricity and 5,107 therms of natural gas.
What are 840 Westchester Ave's carbon emissions?
840 Westchester Ave reported 394 tCO₂e of greenhouse-gas emissions (6.4 kgCO₂e/ft²) for 2023.
Where is 840 Westchester Ave?
840 Westchester Ave is in New York City, New York 10459. Its coordinates are 40.81974, -73.90148 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 840 Westchester Ave and when was it built?
840 Westchester Ave has 62,030 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2007 as its year built. It is classed as mixed use property.
Is 840 Westchester Ave 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, “840 Westchester Ave, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/840-westchester-ave-f4c9dfce (data as of October 2, 2026).