21 East 79th St
Multifamily Housing in New York City, NY · 21 E. 79TH ST. · 10075
At a glance
21 East 79th St is a 55,000-square-foot multifamily housing building at 21 E. 79TH ST. in New York City, New York, built in 1930. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 75.7 kBtu/ft² and 329 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 75.7 kBtu/ft² |
| Source EUI | 122.4 kBtu/ft² |
| GHG emissions | 329 tCO₂e |
| GHG intensity | 6.0 kgCO₂e/ft² |
| Electricity | 317,968 kWh |
| Natural gas | 418 therms |
| Water use | 1,274 kgal |
| Gross floor area | 55,000 sq ft |
| Source record | nyc:2670608:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 75.7 kBtu/ft² | 329 tCO₂e | |
| 2023 | — | 67.2 kBtu/ft² | 288 tCO₂e | |
| 2022 | — | 71.7 kBtu/ft² | 277 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
- 21 E. 79TH ST.
- City
- New York City
- State
- New York
- ZIP
- 10075
- Coordinates
- 40.77661, -73.96278
Within ~1 km
Nearby benchmarked buildings
- Benchmarking Group - 226score —
Other - Recreation · 2,345,603 sq ft
Museum · 2,153,282 sq ft
Multifamily Housing · 1,047,938 sq ft
- Benchmarking Group - 209score —
College/University · 854,879 sq ft
- NH Lenox Hill Hospital Campusscore 64
Hospital (General Medical & Surgical) · 850,896 sq ft
College/University · 751,718 sq ft
See also: most efficient in New York City · biggest emitters
How does 21 East 79th 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 75.7 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 6.0 kgCO₂e/ft² is about 15% above the group average of 5.2 kgCO₂e/ft².
At 55,000 sq ft, it is about half of the average floor area of 100,951 sq ft for those buildings. It was built in 1930, 22 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 21 East 79th St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 21 East 79th St, covering report years 2022–2024. Site EUI moved from 71.7 kBtu/ft² (2022) to 75.7 kBtu/ft² (2024), an 6% increase. Reported emissions went from 277 tCO₂e to 329 tCO₂e over the same span (up 19%).
What does a site EUI of 75.7 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. 21 East 79th St's 75.7 kBtu/ft² across 55,000 sq ft works out to about 4.2 billion Btu (1,220 MWh-equivalent) in 2024. Its source EUI of 122.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 317,968 kWh of electricity, 418 therms of natural gas and 1,274 thousand gallons of water for the year.
Which law requires 21 East 79th St to report its energy use?
21 East 79th 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:2670608:2024). 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
- GROSVENOR MANOR OWNERS CORP· 54,996 sq ft · score 64 (C)
- SAXONY HALL OWNERS INC· 54,991 sq ft · score 79 (B)
- 41-21 42ND STREET CONDOMINIUM· 54,986 sq ft · score 81 (B)
- Norcor: 41-21 42nd St.· 54,986 sq ft · score 79 (B)
- WGL LENOX GROUP LLC· 54,986 sq ft · score 90 (A)
- 59 West 71st Street· 54,966 sq ft · score 88 (A)
- 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 21 East 79th St's energy grade?
21 East 79th St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 75.7 kBtu/ft².
How much energy does 21 East 79th St use?
Its 2024 site energy-use intensity was 75.7 kBtu/ft² (122.4 kBtu/ft² source) across 55,000 sq ft, including 317,968 kWh of electricity and 418 therms of natural gas.
What are 21 East 79th St's carbon emissions?
21 East 79th St reported 329 tCO₂e of greenhouse-gas emissions (6.0 kgCO₂e/ft²) for 2024.
Where is 21 East 79th St?
21 East 79th St is at 21 E. 79TH ST., in New York City, New York 10075. Its coordinates are 40.77661, -73.96278 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 21 East 79th St and when was it built?
21 East 79th St has 55,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1930 as its year built. It is classed as multifamily housing.
Is 21 East 79th 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).
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, “21 East 79th St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/21-east-79th-st-8fbab302 (data as of October 2, 2026).