MMD: 8420 51st Ave
Multifamily Housing in New York City, NY · 8420 51 AVENUE · 11373
At a glance
MMD: 8420 51st Ave is a 55,886-square-foot multifamily housing building at 8420 51 AVENUE in New York City, New York, built in 1961. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 94 out of 100 (grade A), a site energy-use intensity of 65.1 kBtu/ft² and 225 tCO₂e of greenhouse-gas emissions. That score is higher than 82% 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 | 94 (band A) |
| Site EUI | 65.1 kBtu/ft² |
| Source EUI | 84.3 kBtu/ft² |
| GHG emissions | 225 tCO₂e |
| GHG intensity | 4.0 kgCO₂e/ft² |
| Electricity | 149,987 kWh |
| Natural gas | 31,241 therms |
| Water use | 2,779 kgal |
| Gross floor area | 55,886 sq ft |
| Source record | nyc:6309230:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 94 | -1 | 65.1 kBtu/ft² | 225 tCO₂e |
| 2023 | 95 | +1 | 61.3 kBtu/ft² | 210 tCO₂e |
| 2022 | 94 | 66.1 kBtu/ft² | 215 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
- 8420 51 AVENUE
- City
- New York City
- State
- New York
- ZIP
- 11373
- Coordinates
- 40.73830, -73.87896
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does MMD: 8420 51st Ave 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. MMD: 8420 51st Ave's ENERGY STAR score of 94 compares with an average of 63 across the 22,829 that report a score; it scores higher than 82% of them and lower than 17%. Its site EUI of 65.1 kBtu/ft² is about 13% below 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 4.0 kgCO₂e/ft² is about 23% below the group average of 5.2 kgCO₂e/ft².
At 55,886 sq ft, it is about 45% below the average floor area of 100,951 sq ft for those buildings. It was built in 1961, 9 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 MMD: 8420 51st Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for MMD: 8420 51st Ave, covering report years 2022–2024. Its ENERGY STAR score was 94 in both 2022 and 2024. Site EUI moved from 66.1 kBtu/ft² (2022) to 65.1 kBtu/ft² (2024), a 2% decrease. Reported emissions went from 215 tCO₂e to 225 tCO₂e over the same span (up 5%).
What does an ENERGY STAR score of 94 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 94 means the building performs better than about 94% of its national peers. BuildingCensus bands the score into report-card grades; 94 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. MMD: 8420 51st Ave's 65.1 kBtu/ft² across 55,886 sq ft works out to about 3.6 billion Btu (1,066 MWh-equivalent) in 2024. Its source EUI of 84.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 149,987 kWh of electricity, 31,241 therms of natural gas and 2,779 thousand gallons of water for the year.
Which law requires MMD: 8420 51st Ave to report its energy use?
MMD: 8420 51st 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 2024 disclosure (source record nyc:6309230:2024). 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
- zzzzAKAM - 157 East 32nd Street· 55,880 sq ft · score 85 (A)
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- 222 EAST 35 STREET· 55,876 sq ft · score 84 (B)
- AKAM - 28-30 West 38th Street· 55,870 sq ft · score 93 (A)
- 500 West 111th Street· 55,868 sq ft
- 612 W 144th St· 55,867 sq ft · score 51 (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 MMD: 8420 51st Ave's energy grade?
MMD: 8420 51st Ave scores 94 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does MMD: 8420 51st Ave use?
Its 2024 site energy-use intensity was 65.1 kBtu/ft² (84.3 kBtu/ft² source) across 55,886 sq ft, including 149,987 kWh of electricity and 31,241 therms of natural gas.
What are MMD: 8420 51st Ave's carbon emissions?
MMD: 8420 51st Ave reported 225 tCO₂e of greenhouse-gas emissions (4.0 kgCO₂e/ft²) for 2024.
Where is MMD: 8420 51st Ave?
MMD: 8420 51st Ave is at 8420 51 AVENUE, in New York City, New York 11373. Its coordinates are 40.73830, -73.87896 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is MMD: 8420 51st Ave and when was it built?
MMD: 8420 51st Ave has 55,886 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1961 as its year built. It is classed as multifamily housing.
Is MMD: 8420 51st Ave 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, “MMD: 8420 51st Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/mmd-8420-51st-ave-752955ea (data as of October 2, 2026).