Wai Realty Corp - 42-28 Union st
Multifamily Housing in New York City, NY · 42-30 UNION STREET · 11355
At a glance
Wai Realty Corp - 42-28 Union st is a 35,893-square-foot multifamily housing building at 42-30 UNION STREET in New York City, New York, built in 1925. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 100.7 kBtu/ft² and 219 tCO₂e of greenhouse-gas emissions. That score is higher than 80% 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 | 93 (band A) |
| Site EUI | 100.7 kBtu/ft² |
| Source EUI | 127.3 kBtu/ft² |
| GHG emissions | 219 tCO₂e |
| GHG intensity | 6.1 kgCO₂e/ft² |
| Electricity | 129,596 kWh |
| Natural gas | 31,714 therms |
| Water use | 4,058 kgal |
| Gross floor area | 35,893 sq ft |
| Source record | nyc:7379255:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 93 | -1 | 100.7 kBtu/ft² | 219 tCO₂e |
| 2023 | 94 | +3 | 94.2 kBtu/ft² | 205 tCO₂e |
| 2022 | 91 | 106.0 kBtu/ft² | 217 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
- 42-30 UNION STREET
- City
- New York City
- State
- New York
- ZIP
- 11355
- Coordinates
- 40.75714, -73.82458
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Wai Realty Corp - 42-28 Union 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. Wai Realty Corp - 42-28 Union st's ENERGY STAR score of 93 compares with an average of 63 across the 22,829 that report a score; it scores higher than 80% of them and lower than 18%. Its site EUI of 100.7 kBtu/ft² is about 34% 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 6.1 kgCO₂e/ft² is about 18% above the group average of 5.2 kgCO₂e/ft².
At 35,893 sq ft, it is about 64% below the average floor area of 100,951 sq ft for those buildings. It was built in 1925, 27 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 Wai Realty Corp - 42-28 Union st's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Wai Realty Corp - 42-28 Union st, covering report years 2022–2024. Its ENERGY STAR score went from 91 in 2022 to 93 in 2024 (+2 points); its best year on file was 2023, at 94. Site EUI moved from 106.0 kBtu/ft² (2022) to 100.7 kBtu/ft² (2024), a 5% decrease. Reported emissions went from 217 tCO₂e to 219 tCO₂e over the same span (up 1%).
What does an ENERGY STAR score of 93 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 93 means the building performs better than about 93% of its national peers. BuildingCensus bands the score into report-card grades; 93 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. Wai Realty Corp - 42-28 Union st's 100.7 kBtu/ft² across 35,893 sq ft works out to about 3.6 billion Btu (1,059 MWh-equivalent) in 2024. Its source EUI of 127.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 129,596 kWh of electricity, 31,714 therms of natural gas and 4,058 thousand gallons of water for the year.
Which law requires Wai Realty Corp - 42-28 Union st to report its energy use?
Wai Realty Corp - 42-28 Union 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:7379255:2024). 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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- JOSE SALGADO· 35,875 sq ft · score 100 (A)
- 147-37 Beech Avenue· 35,875 sq ft · score 76 (B)
- Axon Construction Inc : 36-23 172 STREET· 35,873 sq ft · score 56 (C)
- 50 Greene· 35,872 sq ft · score 38 (D)
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- 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 Wai Realty Corp - 42-28 Union st's energy grade?
Wai Realty Corp - 42-28 Union st scores 93 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 Wai Realty Corp - 42-28 Union st use?
Its 2024 site energy-use intensity was 100.7 kBtu/ft² (127.3 kBtu/ft² source) across 35,893 sq ft, including 129,596 kWh of electricity and 31,714 therms of natural gas.
What are Wai Realty Corp - 42-28 Union st's carbon emissions?
Wai Realty Corp - 42-28 Union st reported 219 tCO₂e of greenhouse-gas emissions (6.1 kgCO₂e/ft²) for 2024.
Where is Wai Realty Corp - 42-28 Union st?
Wai Realty Corp - 42-28 Union st is at 42-30 UNION STREET, in New York City, New York 11355. Its coordinates are 40.75714, -73.82458 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Wai Realty Corp - 42-28 Union st and when was it built?
Wai Realty Corp - 42-28 Union st has 35,893 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1925 as its year built. It is classed as multifamily housing.
Is Wai Realty Corp - 42-28 Union 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, “Wai Realty Corp - 42-28 Union st, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/wai-realty-corp-42-28-union-st-823daec5 (data as of October 2, 2026).