23 Heyward St
Multifamily Housing in New York City, NY · 23 Heyward Street · 11249
At a glance
23 Heyward St is a 42,861-square-foot multifamily housing building at 23 Heyward Street in New York City, New York, built in 2000. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 58.0 kBtu/ft² and 195 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 58.0 kBtu/ft² |
| Source EUI | 102.5 kBtu/ft² |
| GHG emissions | 195 tCO₂e |
| GHG intensity | 4.5 kgCO₂e/ft² |
| Electricity | 298,157 kWh |
| Natural gas | 14,695 therms |
| Water use | 1,971 kgal |
| Gross floor area | 42,861 sq ft |
| Source record | nyc:32870661:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 58.0 kBtu/ft² | 195 tCO₂e | |
| 2023 | — | 56.3 kBtu/ft² | 183 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
- 23 Heyward Street
- City
- New York City
- State
- New York
- ZIP
- 11249
- Coordinates
- 40.69990, -73.95889
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 23 Heyward St 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. Its site EUI of 58.0 kBtu/ft² is about 23% 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 4.5 kgCO₂e/ft² is about 13% below the group average of 5.2 kgCO₂e/ft².
At 42,861 sq ft, it is about 58% below the average floor area of 100,951 sq ft for those buildings. It was built in 2000, 48 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 23 Heyward St's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 23 Heyward St, covering report years 2023–2024. Site EUI moved from 56.3 kBtu/ft² (2023) to 58.0 kBtu/ft² (2024), an 3% increase. Reported emissions went from 183 tCO₂e to 195 tCO₂e over the same span (up 7%).
What does a site EUI of 58.0 kBtu/ft² mean?
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. 23 Heyward St's 58.0 kBtu/ft² across 42,861 sq ft works out to about 2.5 billion Btu (729 MWh-equivalent) in 2024. Its source EUI of 102.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 298,157 kWh of electricity, 14,695 therms of natural gas and 1,971 thousand gallons of water for the year.
Which law requires 23 Heyward St to report its energy use?
23 Heyward St 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:32870661:2024). 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
- Simry: 244 W 74 St· 42,853 sq ft
- NEW BEDFORD : 140 5· 42,845 sq ft · score 1 (D)
- Andrews: 420 W Broadway· 42,842 sq ft · EUI 82.7 kBtu/ft²
- 8835 23 Ave Tent Corp· 42,840 sq ft · score 50 (D)
- 2111 Beekman place· 42,840 sq ft · score 64 (C)
- Esquire Management - 2111 Beekman place· 42,840 sq ft · score 58 (C)
- 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 23 Heyward St's energy grade?
23 Heyward St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 58.0 kBtu/ft².
How much energy does 23 Heyward St use?
Its 2024 site energy-use intensity was 58.0 kBtu/ft² (102.5 kBtu/ft² source) across 42,861 sq ft, including 298,157 kWh of electricity and 14,695 therms of natural gas.
What are 23 Heyward St's carbon emissions?
23 Heyward St reported 195 tCO₂e of greenhouse-gas emissions (4.5 kgCO₂e/ft²) for 2024.
Where is 23 Heyward St?
23 Heyward St is at 23 Heyward Street, in New York City, New York 11249. Its coordinates are 40.69990, -73.95889 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 23 Heyward St and when was it built?
23 Heyward St has 42,861 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2000 as its year built. It is classed as multifamily housing.
Is 23 Heyward St 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, “23 Heyward St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/23-heyward-st-443f135a (data as of October 2, 2026).