The Ansonia
Multifamily Housing in New York City, NY · 2101 Broadway · 10023
At a glance
The Ansonia is a 678,412-square-foot multifamily housing building at 2101 Broadway in New York City, New York, built in 1904. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 31 out of 100 (grade D), a site energy-use intensity of 94.1 kBtu/ft² and 4,232 tCO₂e of greenhouse-gas emissions. That score is higher than 18% 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 | 31 (band D) |
| Site EUI | 94.1 kBtu/ft² |
| Source EUI | 133.8 kBtu/ft² |
| GHG emissions | 4,232 tCO₂e |
| GHG intensity | 6.2 kgCO₂e/ft² |
| Electricity | 3,986,587 kWh |
| Natural gas | 502,079 therms |
| Gross floor area | 678,412 sq ft |
| Source record | nyc:2811499:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 31 | -3 | 94.1 kBtu/ft² | 4,232 tCO₂e |
| 2023 | 34 | +1 | 93.4 kBtu/ft² | 4,106 tCO₂e |
| 2022 | 33 | 100.1 kBtu/ft² | 4,082 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
- 2101 Broadway
- City
- New York City
- State
- New York
- ZIP
- 10023
- Coordinates
- 40.77972, -73.98169
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does The Ansonia 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. The Ansonia's ENERGY STAR score of 31 compares with an average of 63 across the 22,829 that report a score; it scores higher than 18% of them and lower than 82%. Its site EUI of 94.1 kBtu/ft² is about 26% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.2 kgCO₂e/ft² is about 20% above the group average of 5.2 kgCO₂e/ft².
At 678,412 sq ft, it is about 572% above the average floor area of 100,951 sq ft for those buildings. It was built in 1904, 48 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 The Ansonia's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for The Ansonia, covering report years 2022–2024. Its ENERGY STAR score went from 33 in 2022 to 31 in 2024 (-2 points); its best year on file was 2023, at 34. Site EUI moved from 100.1 kBtu/ft² (2022) to 94.1 kBtu/ft² (2024), a 6% decrease. Reported emissions went from 4,082 tCO₂e to 4,232 tCO₂e over the same span (up 4%).
What does an ENERGY STAR score of 31 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 31 means the building performs better than about 31% of its national peers. BuildingCensus bands the score into report-card grades; 31 falls in band D — lowest band (1–54). It sits 44 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. The Ansonia's 94.1 kBtu/ft² across 678,412 sq ft works out to about 63.8 billion Btu (18,709 MWh-equivalent) in 2024. Its source EUI of 133.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,986,587 kWh of electricity and 502,079 therms of natural gas for the year.
Which law requires The Ansonia to report its energy use?
The Ansonia 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:2811499:2024). 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
- Tangram House West Condominium (37-11 College Point Boulevard)· 678,292 sq ft · score 100 (A)
- Clinton Hill South· 677,534 sq ft · score 59 (C)
- AKAM - 15 West 72nd Street· 674,192 sq ft · score 71 (B)
- 3450 Wayne Ave· 673,910 sq ft · score 56 (C)
- Taft - Bldgs 6-9· 673,410 sq ft · EUI 47.4 kBtu/ft²
- Milstein - 30 West 63rd Street· 672,137 sq ft · score 43 (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 The Ansonia's energy grade?
The Ansonia scores 31 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 The Ansonia use?
Its 2024 site energy-use intensity was 94.1 kBtu/ft² (133.8 kBtu/ft² source) across 678,412 sq ft, including 3,986,587 kWh of electricity and 502,079 therms of natural gas.
What are The Ansonia's carbon emissions?
The Ansonia reported 4,232 tCO₂e of greenhouse-gas emissions (6.2 kgCO₂e/ft²) for 2024.
Where is The Ansonia?
The Ansonia is at 2101 Broadway, in New York City, New York 10023. Its coordinates are 40.77972, -73.98169 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is The Ansonia and when was it built?
The Ansonia has 678,412 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1904 as its year built. It is classed as multifamily housing.
Is The Ansonia 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, “The Ansonia, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/the-ansonia-7bcfc67e (data as of October 2, 2026).