Alef Realty: 577 Isham Street
Multifamily Housing in New York City, NY · 577 Isham Street · 10034
At a glance
Alef Realty: 577 Isham Street is a 44,006-square-foot multifamily housing building 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 121.1 kBtu/ft² and 358 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 121.1 kBtu/ft² |
| Source EUI | 175.5 kBtu/ft² |
| GHG emissions | 358 tCO₂e |
| GHG intensity | 8.1 kgCO₂e/ft² |
| Electricity | 355,873 kWh |
| Natural gas | 41,155 therms |
| Gross floor area | 44,006 sq ft |
| Source record | nyc:6282446:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 121.1 kBtu/ft² | 358 tCO₂e | |
| 2023 | — | 119.1 kBtu/ft² | 345 tCO₂e | |
| 2022 | — | 117.8 kBtu/ft² | 313 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
- 577 Isham Street
- City
- New York City
- State
- New York
- ZIP
- 10034
- Coordinates
- 40.86825, -73.91983
Within ~1 km
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How does Alef Realty: 577 Isham Street 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 121.1 kBtu/ft² is about 62% 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 8.1 kgCO₂e/ft² is about 57% above the group average of 5.2 kgCO₂e/ft².
At 44,006 sq ft, it is about 56% below 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 Alef Realty: 577 Isham Street's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Alef Realty: 577 Isham Street, covering report years 2022–2024. Site EUI moved from 117.8 kBtu/ft² (2022) to 121.1 kBtu/ft² (2024), an 3% increase. Reported emissions went from 313 tCO₂e to 358 tCO₂e over the same span (up 15%).
What does a site EUI of 121.1 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. Alef Realty: 577 Isham Street's 121.1 kBtu/ft² across 44,006 sq ft works out to about 5.3 billion Btu (1,562 MWh-equivalent) in 2024. Its source EUI of 175.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 355,873 kWh of electricity and 41,155 therms of natural gas for the year.
Which law requires Alef Realty: 577 Isham Street to report its energy use?
Alef Realty: 577 Isham Street 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:6282446:2024). 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.
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Frequently asked questions
What is Alef Realty: 577 Isham Street's energy grade?
Alef Realty: 577 Isham Street did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 121.1 kBtu/ft².
How much energy does Alef Realty: 577 Isham Street use?
Its 2024 site energy-use intensity was 121.1 kBtu/ft² (175.5 kBtu/ft² source) across 44,006 sq ft, including 355,873 kWh of electricity and 41,155 therms of natural gas.
What are Alef Realty: 577 Isham Street's carbon emissions?
Alef Realty: 577 Isham Street reported 358 tCO₂e of greenhouse-gas emissions (8.1 kgCO₂e/ft²) for 2024.
Where is Alef Realty: 577 Isham Street?
Alef Realty: 577 Isham Street is in New York City, New York 10034. Its coordinates are 40.86825, -73.91983 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Alef Realty: 577 Isham Street and when was it built?
Alef Realty: 577 Isham Street has 44,006 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 Alef Realty: 577 Isham Street 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, “Alef Realty: 577 Isham Street, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/alef-realty-577-isham-street-ebfbe6e5 (data as of October 2, 2026).