HRV: 31-64 21st St
Multifamily Housing in New York City, NY · 31-64 21st Street · 11106
At a glance
HRV: 31-64 21st St is a 49,576-square-foot multifamily housing building at 31-64 21st Street in New York City, New York, built in 2002. 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 56.2 kBtu/ft² and 186 tCO₂e of greenhouse-gas emissions. That score is higher than 78% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 91 (band A) |
| Site EUI | 56.2 kBtu/ft² |
| Source EUI | 83.0 kBtu/ft² |
| GHG emissions | 186 tCO₂e |
| GHG intensity | 3.7 kgCO₂e/ft² |
| Electricity | 198,838 kWh |
| Natural gas | 21,082 therms |
| Water use | 1,853 kgal |
| Gross floor area | 49,576 sq ft |
| Source record | nyc:6282661:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 91 | ±0 | 56.2 kBtu/ft² | 186 tCO₂e |
| 2022 | 91 | 61.0 kBtu/ft² | 182 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 31-64 21st Street
- City
- New York City
- State
- New York
- ZIP
- 11106
- Coordinates
- 40.76570, -73.93124
Within ~1 km
Nearby benchmarked buildings
- RAVENSWOOD CAMPUSscore 11
Multifamily Housing · 2,197,500 sq ft
- ASTORIAscore 10
Multifamily Housing · 1,211,610 sq ft
Multifamily Housing · 799,833 sq ft
Multifamily Housing · 635,040 sq ft
- Ravenswood - Bldgs 9-17score —
Multifamily Housing · 587,000 sq ft
- Ravenswood - Bldgs 18-25score —
Multifamily Housing · 580,200 sq ft
See also: most efficient in New York City · biggest emitters
How does HRV: 31-64 21st 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. HRV: 31-64 21st St's ENERGY STAR score of 91 compares with an average of 63 across the 22,829 that report a score; it scores higher than 78% of them and lower than 21%. Its site EUI of 56.2 kBtu/ft² is about 25% 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 3.7 kgCO₂e/ft² is about 29% below the group average of 5.2 kgCO₂e/ft².
At 49,576 sq ft, it is about half of the average floor area of 100,951 sq ft for those buildings. It was built in 2002, 50 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 HRV: 31-64 21st St's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for HRV: 31-64 21st St, covering report years 2022–2023. Its ENERGY STAR score was 91 in both 2022 and 2023. Site EUI moved from 61.0 kBtu/ft² (2022) to 56.2 kBtu/ft² (2023), a 8% decrease. Reported emissions went from 182 tCO₂e to 186 tCO₂e over the same span (up 2%).
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. HRV: 31-64 21st St's 56.2 kBtu/ft² across 49,576 sq ft works out to about 2.8 billion Btu (817 MWh-equivalent) in 2023. Its source EUI of 83.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 198,838 kWh of electricity, 21,082 therms of natural gas and 1,853 thousand gallons of water for the year.
Which law requires HRV: 31-64 21st St to report its energy use?
HRV: 31-64 21st 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 2023 disclosure (source record nyc:6282661:2023). 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.
More multifamily housing buildings in New York City
- Watermark Capital Management : 260 Knickerbocker· 49,573 sq ft · score 72 (B)
- 390 EAST 153 STREET - 38876· 49,566 sq ft · score 68 (C)
- 3162 VILLA AVE.· 49,563 sq ft
- 183 Thompson - Sullivan St· 49,557 sq ft · score 67 (C)
- Lawrence Bernstein & CO: 308 Sterling St· 49,552 sq ft · score 19 (D)
- Lawrence Bernstein & CO: 317 Lefferts Ave· 49,552 sq ft · score 41 (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 HRV: 31-64 21st St's energy grade?
HRV: 31-64 21st St 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 HRV: 31-64 21st St use?
Its 2023 site energy-use intensity was 56.2 kBtu/ft² (83.0 kBtu/ft² source) across 49,576 sq ft, including 198,838 kWh of electricity and 21,082 therms of natural gas.
What are HRV: 31-64 21st St's carbon emissions?
HRV: 31-64 21st St reported 186 tCO₂e of greenhouse-gas emissions (3.7 kgCO₂e/ft²) for 2023.
Where is HRV: 31-64 21st St?
HRV: 31-64 21st St is at 31-64 21st Street, in New York City, New York 11106. Its coordinates are 40.76570, -73.93124 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is HRV: 31-64 21st St and when was it built?
HRV: 31-64 21st St has 49,576 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2002 as its year built. It is classed as multifamily housing.
Is HRV: 31-64 21st St 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).
Working with New York City building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “HRV: 31-64 21st St, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/hrv-31-64-21st-st-ab64ca95 (data as of October 2, 2026).