XX(7412) - Southgate - 433 (433 East 51st St)
Multifamily Housing in New York City, NY · 429 East 51st St · 10022
At a glance
XX(7412) - Southgate - 433 (433 East 51st St) is a 102,790-square-foot multifamily housing building at 429 East 51st St in New York City, New York, built in 1930. 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 1.4 kBtu/ft² and 7 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 | 1.4 kBtu/ft² |
| Source EUI | 1.4 kBtu/ft² |
| GHG emissions | 7 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Natural gas | 1,398 therms |
| Gross floor area | 102,790 sq ft |
| Source record | nyc:2721379:2024 |
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
- 429 East 51st St
- City
- New York City
- State
- New York
- ZIP
- 10022
- Coordinates
- 40.75410, -73.96471
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does XX(7412) - Southgate - 433 (433 East 51st 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. XX(7412) - Southgate - 433 (433 East 51st St)'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 1.4 kBtu/ft² is about 98% 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 0.1 kgCO₂e/ft² is about 99% below the group average of 5.2 kgCO₂e/ft².
At 102,790 sq ft, it is roughly in line with 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.
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. XX(7412) - Southgate - 433 (433 East 51st St)'s 1.4 kBtu/ft² across 102,790 sq ft works out to about 0.1 billion Btu (42 MWh-equivalent) in 2024. Its source EUI of 1.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is different. The disclosure also reports 1,398 therms of natural gas for the year.
Which law requires XX(7412) - Southgate - 433 (433 East 51st St) to report its energy use?
XX(7412) - Southgate - 433 (433 East 51st 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:2721379:2024). 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
- 56 N 9 St· 102,789 sq ft · score 52 (D)
- Stonehenge - 20 Park Avenue· 102,740 sq ft · score 55 (C)
- Copy of Stonehenge - 20 Park Avenue· 102,740 sq ft · score 47 (D)
- New West 2: 24-30, 46-50, 52-56: NW2: 24-56 W 111· 102,736 sq ft · score 71 (B)
- New West 1: 8-44: NW1: 8 - 44 W 111· 102,736 sq ft · score 62 (C)
- Century - 1213 Avenue Z (Child - 1213 Ave Z)· 102,727 sq ft · score 1 (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 XX(7412) - Southgate - 433 (433 East 51st St)'s energy grade?
XX(7412) - Southgate - 433 (433 East 51st St) 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 XX(7412) - Southgate - 433 (433 East 51st St) use?
Its 2024 site energy-use intensity was 1.4 kBtu/ft² (1.4 kBtu/ft² source) across 102,790 sq ft and 1,398 therms of natural gas.
What are XX(7412) - Southgate - 433 (433 East 51st St)'s carbon emissions?
XX(7412) - Southgate - 433 (433 East 51st St) reported 7 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2024.
Where is XX(7412) - Southgate - 433 (433 East 51st St)?
XX(7412) - Southgate - 433 (433 East 51st St) is at 429 East 51st St, in New York City, New York 10022. Its coordinates are 40.75410, -73.96471 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is XX(7412) - Southgate - 433 (433 East 51st St) and when was it built?
XX(7412) - Southgate - 433 (433 East 51st St) has 102,790 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 XX(7412) - Southgate - 433 (433 East 51st 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).
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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, “XX(7412) - Southgate - 433 (433 East 51st St), New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/xx-7412-southgate-433-433-east-51st-st-0a38dea8 (data as of October 2, 2026).