Heritage Realty: 643 W 171st St
Multifamily Housing in New York City, NY · 643 W 171st St · 10032
At a glance
Heritage Realty: 643 W 171st St is a 27,825-square-foot multifamily housing building in New York City, New York, built in 1914. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 85 out of 100 (grade A), a site energy-use intensity of 75.1 kBtu/ft² and 136 tCO₂e of greenhouse-gas emissions. That score is higher than 70% 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 | 85 (band A) |
| Site EUI | 75.1 kBtu/ft² |
| Source EUI | 104.3 kBtu/ft² |
| GHG emissions | 136 tCO₂e |
| GHG intensity | 4.9 kgCO₂e/ft² |
| Electricity | 118,821 kWh |
| Natural gas | 16,834 therms |
| Water use | 1,320 kgal |
| Gross floor area | 27,825 sq ft |
| Source record | nyc:6282658:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 85 | -15 | 75.1 kBtu/ft² | 136 tCO₂e |
| 2023 | 100 | ±0 | 20.2 kBtu/ft² | 53 tCO₂e |
| 2022 | 100 | 21.2 kBtu/ft² | 45 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
- 643 W 171st St
- City
- New York City
- State
- New York
- ZIP
- 10032
- Coordinates
- 40.84354, -73.93990
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Heritage Realty: 643 W 171st 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. Heritage Realty: 643 W 171st St's ENERGY STAR score of 85 compares with an average of 63 across the 22,829 that report a score; it scores higher than 70% of them and lower than 29%. Its site EUI of 75.1 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 4.9 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².
At 27,825 sq ft, it is about 72% below the average floor area of 100,951 sq ft for those buildings. It was built in 1914, 38 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 Heritage Realty: 643 W 171st St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Heritage Realty: 643 W 171st St, covering report years 2022–2024. Its ENERGY STAR score went from 100 in 2022 to 85 in 2024 (-15 points); its best year on file was 2022, at 100. Site EUI moved from 21.2 kBtu/ft² (2022) to 75.1 kBtu/ft² (2024), an 254% increase. Reported emissions went from 45 tCO₂e to 136 tCO₂e over the same span (up 201%).
What does an ENERGY STAR score of 85 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 85 means the building performs better than about 85% of its national peers. BuildingCensus bands the score into report-card grades; 85 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. Heritage Realty: 643 W 171st St's 75.1 kBtu/ft² across 27,825 sq ft works out to about 2.1 billion Btu (612 MWh-equivalent) in 2024. Its source EUI of 104.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 118,821 kWh of electricity, 16,834 therms of natural gas and 1,320 thousand gallons of water for the year.
Which law requires Heritage Realty: 643 W 171st St to report its energy use?
Heritage Realty: 643 W 171st 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:6282658:2024). 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
- MILLER: 234 East 178 Street· 27,820 sq ft · score 75 (B)
- 1611 FOSTER AVE CORP: 633 E 16th· 27,820 sq ft · score 38 (D)
- SLJ: 1046 Amsterdam· 27,820 sq ft · score 83 (B)
- Brownstone Professional Services - 606 West 137th Street· 27,810 sq ft · score 17 (D)
- 612 West 137th Street: 612 West 137th Street· 27,810 sq ft · score 90 (A)
- Highland Hills Realty Ltd· 27,805 sq ft · score 19 (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 Heritage Realty: 643 W 171st St's energy grade?
Heritage Realty: 643 W 171st St scores 85 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 Heritage Realty: 643 W 171st St use?
Its 2024 site energy-use intensity was 75.1 kBtu/ft² (104.3 kBtu/ft² source) across 27,825 sq ft, including 118,821 kWh of electricity and 16,834 therms of natural gas.
What are Heritage Realty: 643 W 171st St's carbon emissions?
Heritage Realty: 643 W 171st St reported 136 tCO₂e of greenhouse-gas emissions (4.9 kgCO₂e/ft²) for 2024.
Where is Heritage Realty: 643 W 171st St?
Heritage Realty: 643 W 171st St is in New York City, New York 10032. Its coordinates are 40.84354, -73.93990 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Heritage Realty: 643 W 171st St and when was it built?
Heritage Realty: 643 W 171st St has 27,825 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1914 as its year built. It is classed as multifamily housing.
Is Heritage Realty: 643 W 171st 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, “Heritage Realty: 643 W 171st St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/heritage-realty-643-w-171st-st-918af5d6 (data as of October 2, 2026).