43-01 21st Street LLC
Office in New York City, NY · 43-01 21st Street · 11101
At a glance
43-01 21st Street LLC is a 124,000-square-foot office building in New York City, New York, built in 1926. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 91 out of 100 (grade A), a site energy-use intensity of 47.9 kBtu/ft² and 452 tCO₂e of greenhouse-gas emissions. That score is higher than 77% of the 2,519 scored office buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 91 (band A) |
| Site EUI | 47.9 kBtu/ft² |
| Source EUI | 84.9 kBtu/ft² |
| GHG emissions | 452 tCO₂e |
| GHG intensity | 3.6 kgCO₂e/ft² |
| Electricity | 719,083 kWh |
| Natural gas | 34,822 therms |
| Gross floor area | 124,000 sq ft |
| Source record | nyc:8025281:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 91 | +2 | 47.9 kBtu/ft² | 452 tCO₂e |
| 2022 | 89 | 50.7 kBtu/ft² | 446 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
- 43-01 21st Street
- City
- New York City
- State
- New York
- ZIP
- 11101
- Coordinates
- 40.75056, -73.94572
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 43-01 21st Street LLC 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. 43-01 21st Street LLC's ENERGY STAR score of 91 compares with an average of 72 across the 2,519 that report a score; it scores higher than 77% of them and lower than 21%. Its site EUI of 47.9 kBtu/ft² is about 26% 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 3.6 kgCO₂e/ft² is about 38% below the group average of 5.8 kgCO₂e/ft².
At 124,000 sq ft, it is about 40% below the average floor area of 205,440 sq ft for those buildings. It was built in 1926, 14 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 43-01 21st Street LLC's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 43-01 21st Street LLC, covering report years 2022–2023. Its ENERGY STAR score went from 89 in 2022 to 91 in 2023 (+2 points). Site EUI moved from 50.7 kBtu/ft² (2022) to 47.9 kBtu/ft² (2023), a 6% decrease. Reported emissions went from 446 tCO₂e to 452 tCO₂e over the same span (up 1%).
What does an ENERGY STAR score of 91 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 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 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. 43-01 21st Street LLC's 47.9 kBtu/ft² across 124,000 sq ft works out to about 5.9 billion Btu (1,741 MWh-equivalent) in 2023. Its source EUI of 84.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 719,083 kWh of electricity and 34,822 therms of natural gas for the year.
Which law requires 43-01 21st Street LLC to report its energy use?
43-01 21st Street LLC 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:8025281:2023). 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.
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Frequently asked questions
What is 43-01 21st Street LLC's energy grade?
43-01 21st Street LLC scores 91 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 43-01 21st Street LLC use?
Its 2023 site energy-use intensity was 47.9 kBtu/ft² (84.9 kBtu/ft² source) across 124,000 sq ft, including 719,083 kWh of electricity and 34,822 therms of natural gas.
What are 43-01 21st Street LLC's carbon emissions?
43-01 21st Street LLC reported 452 tCO₂e of greenhouse-gas emissions (3.6 kgCO₂e/ft²) for 2023.
Where is 43-01 21st Street LLC?
43-01 21st Street LLC is in New York City, New York 11101. Its coordinates are 40.75056, -73.94572 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 43-01 21st Street LLC and when was it built?
43-01 21st Street LLC has 124,000 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1926 as its year built. It is classed as office.
Is 43-01 21st Street LLC 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, “43-01 21st Street LLC, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/43-01-21st-street-llc-57aa026c (data as of October 2, 2026).