823 Classon Avenue
Multifamily Housing in New York City, NY · 11238
At a glance
823 Classon Avenue is a 26,271-square-foot multifamily housing building in New York City, New York, built in 1925. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 46 out of 100 (grade D), a site energy-use intensity of 71.2 kBtu/ft² and 153 tCO₂e of greenhouse-gas emissions. That score is higher than 28% 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 | 46 (band D) |
| Site EUI | 71.2 kBtu/ft² |
| Source EUI | 144.8 kBtu/ft² |
| GHG emissions | 153 tCO₂e |
| GHG intensity | 6.3 kgCO₂e/ft² |
| Electricity | 286,798 kWh |
| Natural gas | 7,611 therms |
| Water use | 1,459 kgal |
| Gross floor area | 26,271 sq ft |
| Source record | nyc:7404052:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 46 | +7 | 71.2 kBtu/ft² | 153 tCO₂e |
| 2023 | 39 | +7 | 75.7 kBtu/ft² | 153 tCO₂e |
| 2022 | 32 | 84.3 kBtu/ft² | 143 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
- 823 Classon Avenue
- City
- New York City
- State
- New York
- ZIP
- 11238
- Coordinates
- 40.67261, -73.96089
Within ~1 km
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How does 823 Classon Avenue 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. 823 Classon Avenue's ENERGY STAR score of 46 compares with an average of 63 across the 22,829 that report a score; it scores higher than 28% of them and lower than 71%. Its site EUI of 71.2 kBtu/ft² is roughly in line with 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 6.3 kgCO₂e/ft² is about 20% above the group average of 5.2 kgCO₂e/ft².
At 26,271 sq ft, it is about 74% below the average floor area of 100,951 sq ft for those buildings. It was built in 1925, 27 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 823 Classon Avenue's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 823 Classon Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 32 in 2022 to 46 in 2024 (+14 points). Site EUI moved from 84.3 kBtu/ft² (2022) to 71.2 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 143 tCO₂e to 153 tCO₂e over the same span (up 7%).
What does an ENERGY STAR score of 46 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 46 means the building performs better than about 46% of its national peers. BuildingCensus bands the score into report-card grades; 46 falls in band D — lowest band (1–54). It sits 29 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. 823 Classon Avenue's 71.2 kBtu/ft² across 26,271 sq ft works out to about 1.9 billion Btu (548 MWh-equivalent) in 2024. Its source EUI of 144.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 286,798 kWh of electricity, 7,611 therms of natural gas and 1,459 thousand gallons of water for the year.
Which law requires 823 Classon Avenue to report its energy use?
823 Classon Avenue 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:7404052:2024). 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
- 192 De Graw Street· 26,265 sq ft
- 492 Henry Street· 26,264 sq ft
- 504 Park Ave· 26,260 sq ft · EUI 54.5 kBtu/ft²
- 504 Park Ave· 26,260 sq ft · score 91 (A)
- 2144 Prospect Realty LLC - 2144 Prospect Ave· 26,260 sq ft · score 96 (A)
- 51-53 LORIMER STREET· 26,256 sq ft · EUI 51.2 kBtu/ft²
- 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 823 Classon Avenue's energy grade?
823 Classon Avenue scores 46 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 823 Classon Avenue use?
Its 2024 site energy-use intensity was 71.2 kBtu/ft² (144.8 kBtu/ft² source) across 26,271 sq ft, including 286,798 kWh of electricity and 7,611 therms of natural gas.
What are 823 Classon Avenue's carbon emissions?
823 Classon Avenue reported 153 tCO₂e of greenhouse-gas emissions (6.3 kgCO₂e/ft²) for 2024.
Where is 823 Classon Avenue?
823 Classon Avenue is in New York City, New York 11238. Its coordinates are 40.67261, -73.96089 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 823 Classon Avenue and when was it built?
823 Classon Avenue has 26,271 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1925 as its year built. It is classed as multifamily housing.
Is 823 Classon Avenue 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, “823 Classon Avenue, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/823-classon-avenue-1f6ffb99 (data as of October 2, 2026).