Alef Realty (parent): 585-603 Isham
Multifamily Housing in New York City, NY · 585-603 Isham Street · 10034
At a glance
Alef Realty (parent): 585-603 Isham is a 77,433-square-foot multifamily housing building at 585-603 Isham Street in New York City, New York, built in 1930. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 94 out of 100 (grade A), a site energy-use intensity of 56.7 kBtu/ft² and 279 tCO₂e of greenhouse-gas emissions. That score is higher than 82% 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 | 94 (band A) |
| Site EUI | 56.7 kBtu/ft² |
| Source EUI | 78.1 kBtu/ft² |
| GHG emissions | 279 tCO₂e |
| GHG intensity | 3.6 kgCO₂e/ft² |
| Electricity | 240,674 kWh |
| Natural gas | 35,699 therms |
| Gross floor area | 77,433 sq ft |
| Source record | nyc:10821705:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 94 | +6 | 56.7 kBtu/ft² | 279 tCO₂e |
| 2022 | 88 | 68.6 kBtu/ft² | 310 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
- 585-603 Isham Street
- City
- New York City
- State
- New York
- ZIP
- 10034
- Coordinates
- 40.86839, -73.91992
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Alef Realty (parent): 585-603 Isham 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. Alef Realty (parent): 585-603 Isham's ENERGY STAR score of 94 compares with an average of 63 across the 22,829 that report a score; it scores higher than 82% of them and lower than 17%. Its site EUI of 56.7 kBtu/ft² is about 24% 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 3.6 kgCO₂e/ft² is about 31% below the group average of 5.2 kgCO₂e/ft².
At 77,433 sq ft, it is about 23% 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 (parent): 585-603 Isham's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for Alef Realty (parent): 585-603 Isham, covering report years 2022–2023. Its ENERGY STAR score went from 88 in 2022 to 94 in 2023 (+6 points). Site EUI moved from 68.6 kBtu/ft² (2022) to 56.7 kBtu/ft² (2023), a 17% decrease. Reported emissions went from 310 tCO₂e to 279 tCO₂e over the same span (down 10%).
What does an ENERGY STAR score of 94 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 94 means the building performs better than about 94% of its national peers. BuildingCensus bands the score into report-card grades; 94 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. Alef Realty (parent): 585-603 Isham's 56.7 kBtu/ft² across 77,433 sq ft works out to about 4.4 billion Btu (1,287 MWh-equivalent) in 2023. Its source EUI of 78.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 240,674 kWh of electricity and 35,699 therms of natural gas for the year.
Which law requires Alef Realty (parent): 585-603 Isham to report its energy use?
Alef Realty (parent): 585-603 Isham 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:10821705:2023). 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
- 155 East 93rd Street· 77,426 sq ft · score 100 (A)
- MILLER: 3109 Brighton 7th Street· 77,425 sq ft · score 90 (A)
- 2320, 2320 Bronx Park East· 77,418 sq ft · score 73 (B)
- 143-43 41st Avenue· 77,410 sq ft
- JWavecrest - 1016 Washington Avenue· 77,401 sq ft · score 69 (C)
- 101 Ocean Parkway· 77,400 sq ft · score 76 (B)
- 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 Alef Realty (parent): 585-603 Isham's energy grade?
Alef Realty (parent): 585-603 Isham scores 94 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 Alef Realty (parent): 585-603 Isham use?
Its 2023 site energy-use intensity was 56.7 kBtu/ft² (78.1 kBtu/ft² source) across 77,433 sq ft, including 240,674 kWh of electricity and 35,699 therms of natural gas.
What are Alef Realty (parent): 585-603 Isham's carbon emissions?
Alef Realty (parent): 585-603 Isham reported 279 tCO₂e of greenhouse-gas emissions (3.6 kgCO₂e/ft²) for 2023.
Where is Alef Realty (parent): 585-603 Isham?
Alef Realty (parent): 585-603 Isham is at 585-603 Isham Street, in New York City, New York 10034. Its coordinates are 40.86839, -73.91992 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Alef Realty (parent): 585-603 Isham and when was it built?
Alef Realty (parent): 585-603 Isham has 77,433 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1930 as its year built. It is classed as multifamily housing.
Is Alef Realty (parent): 585-603 Isham 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).
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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 (parent): 585-603 Isham, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/alef-realty-parent-585-603-isham-9b8a5e10 (data as of October 2, 2026).