21-01 51st Avenue
Office in New York City, NY · 11101
At a glance
21-01 51st Avenue is a 45,977-square-foot office building in New York City, New York, built in 1913. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 98 out of 100 (grade A), a site energy-use intensity of 17.6 kBtu/ft² and 93 tCO₂e of greenhouse-gas emissions. That score is higher than 92% of the 2,519 scored office buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 98 (band A) |
| Site EUI | 17.6 kBtu/ft² |
| Source EUI | 49.3 kBtu/ft² |
| GHG emissions | 93 tCO₂e |
| GHG intensity | 2.0 kgCO₂e/ft² |
| Electricity | 237,335 kWh |
| Gross floor area | 45,977 sq ft |
| Source record | nyc:20652429:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 98 | -1 | 17.6 kBtu/ft² | 93 tCO₂e |
| 2023 | 99 | ±0 | 15.1 kBtu/ft² | 75 tCO₂e |
| 2022 | 99 | 14.2 kBtu/ft² | 55 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
- 21-01 51st Avenue
- City
- New York City
- State
- New York
- ZIP
- 11101
- Coordinates
- 40.74107, -73.94934
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 21-01 51st Avenue compare with other office buildings in New York City?
The latest disclosures cover 3,384 office buildings in New York City, out of 48,310 buildings citywide. 21-01 51st Avenue's ENERGY STAR score of 98 compares with an average of 72 across the 2,519 that report a score; it scores higher than 92% of them and lower than 6%. Its site EUI of 17.6 kBtu/ft² is about 73% below the average of 64.5 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.0 kgCO₂e/ft² is about 65% below the group average of 5.8 kgCO₂e/ft².
At 45,977 sq ft, it is about 78% below the average floor area of 205,440 sq ft for those buildings. It was built in 1913, 27 years earlier than the group's average year built (1940). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has 21-01 51st Avenue's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 21-01 51st Avenue, covering report years 2022–2024. Its ENERGY STAR score went from 99 in 2022 to 98 in 2024 (-1 points); its best year on file was 2022, at 99. Site EUI moved from 14.2 kBtu/ft² (2022) to 17.6 kBtu/ft² (2024), an 24% increase. Reported emissions went from 55 tCO₂e to 93 tCO₂e over the same span (up 69%).
What does an ENERGY STAR score of 98 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 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 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. 21-01 51st Avenue's 17.6 kBtu/ft² across 45,977 sq ft works out to about 0.8 billion Btu (237 MWh-equivalent) in 2024. Its source EUI of 49.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 237,335 kWh of electricity for the year.
Which law requires 21-01 51st Avenue to report its energy use?
21-01 51st 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:20652429:2024). 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 office buildings in New York City
- 429 West 53rd Street· 45,976 sq ft · score 39 (D)
- Willoughby Management - 716 Myrtle ave· 45,939 sq ft · score 82 (B)
- CB - 363 Lafayette Street· 45,884 sq ft · score 76 (B)
- Alianza Triangle Building· 45,857 sq ft · score 71 (B)
- 155 East 56th Street· 45,836 sq ft · score 66 (C)
- 42-01 35 Street· 45,790 sq ft · score 77 (B)
- Office buildings in New York City· 3,384 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 21-01 51st Avenue's energy grade?
21-01 51st Avenue scores 98 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 21-01 51st Avenue use?
Its 2024 site energy-use intensity was 17.6 kBtu/ft² (49.3 kBtu/ft² source) across 45,977 sq ft, including 237,335 kWh of electricity.
What are 21-01 51st Avenue's carbon emissions?
21-01 51st Avenue reported 93 tCO₂e of greenhouse-gas emissions (2.0 kgCO₂e/ft²) for 2024.
Where is 21-01 51st Avenue?
21-01 51st Avenue is in New York City, New York 11101. Its coordinates are 40.74107, -73.94934 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 21-01 51st Avenue and when was it built?
21-01 51st Avenue has 45,977 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1913 as its year built. It is classed as office.
Is 21-01 51st 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, “21-01 51st Avenue, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/21-01-51st-avenue-d122068d (data as of October 2, 2026).