621 Avenue Z NatGrid Placeholder
Multifamily Housing in New York City, NY · 621 Avenue Z · 11223
At a glance
621 Avenue Z NatGrid Placeholder is a 68,332-square-foot multifamily housing building in New York City, New York, built in 1949. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 43.5 kBtu/ft² and 158 tCO₂e of greenhouse-gas emissions. That score is higher than 90% 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 | 100 (band A) |
| Site EUI | 43.5 kBtu/ft² |
| Source EUI | 45.7 kBtu/ft² |
| GHG emissions | 158 tCO₂e |
| GHG intensity | 2.3 kgCO₂e/ft² |
| Natural gas | 29,729 therms |
| Gross floor area | 68,332 sq ft |
| Source record | nyc:2736145:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 100 | ±0 | 43.5 kBtu/ft² | 158 tCO₂e |
| 2023 | 100 | 42.3 kBtu/ft² | 154 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
- 621 Avenue Z
- City
- New York City
- State
- New York
- ZIP
- 11223
- Coordinates
- 40.58615, -73.97090
Within ~1 km
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How does 621 Avenue Z NatGrid Placeholder 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. 621 Avenue Z NatGrid Placeholder's ENERGY STAR score of 100 compares with an average of 63 across the 22,829 that report a score; it scores higher than 90% of them. Its site EUI of 43.5 kBtu/ft² is about 42% 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 2.3 kgCO₂e/ft² is about 56% below the group average of 5.2 kgCO₂e/ft².
At 68,332 sq ft, it is about 32% below the average floor area of 100,951 sq ft for those buildings. It was built in 1949, 3 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 621 Avenue Z NatGrid Placeholder's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 621 Avenue Z NatGrid Placeholder, covering report years 2023–2024. Its ENERGY STAR score was 100 in both 2023 and 2024. Site EUI moved from 42.3 kBtu/ft² (2023) to 43.5 kBtu/ft² (2024), an 3% increase. Reported emissions went from 154 tCO₂e to 158 tCO₂e over the same span (up 3%).
What does an ENERGY STAR score of 100 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: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 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. 621 Avenue Z NatGrid Placeholder's 43.5 kBtu/ft² across 68,332 sq ft works out to about 3 billion Btu (871 MWh-equivalent) in 2024. Its source EUI of 45.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 29,729 therms of natural gas for the year.
Which law requires 621 Avenue Z NatGrid Placeholder to report its energy use?
621 Avenue Z NatGrid Placeholder 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:2736145:2024). 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
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- 83-02 Cornish Avenue· 68,326 sq ft · score 82 (B)
- 2244 Bronx Park East· 68,325 sq ft
- 74th Street Apartments Inc. (168 E. 74th Street)· 68,323 sq ft · score 97 (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 621 Avenue Z NatGrid Placeholder's energy grade?
621 Avenue Z NatGrid Placeholder scores 100 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 621 Avenue Z NatGrid Placeholder use?
Its 2024 site energy-use intensity was 43.5 kBtu/ft² (45.7 kBtu/ft² source) across 68,332 sq ft and 29,729 therms of natural gas.
What are 621 Avenue Z NatGrid Placeholder's carbon emissions?
621 Avenue Z NatGrid Placeholder reported 158 tCO₂e of greenhouse-gas emissions (2.3 kgCO₂e/ft²) for 2024.
Where is 621 Avenue Z NatGrid Placeholder?
621 Avenue Z NatGrid Placeholder is in New York City, New York 11223. Its coordinates are 40.58615, -73.97090 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 621 Avenue Z NatGrid Placeholder and when was it built?
621 Avenue Z NatGrid Placeholder has 68,332 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1949 as its year built. It is classed as multifamily housing.
Is 621 Avenue Z NatGrid Placeholder 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, “621 Avenue Z NatGrid Placeholder, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/621-avenue-z-natgrid-placeholder-d98d9929 (data as of October 2, 2026).