Alfa -15 West 18th Street
Office in New York City, NY · 15 West 18th Street · 10011
At a glance
Alfa -15 West 18th Street is a 47,225-square-foot office building in New York City, New York, built in 1903. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 135.5 kBtu/ft² and 476 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 135.5 kBtu/ft² |
| Source EUI | 223.6 kBtu/ft² |
| GHG emissions | 476 tCO₂e |
| GHG intensity | 10.1 kgCO₂e/ft² |
| Electricity | 643,254 kWh |
| Natural gas | 42,019 therms |
| Gross floor area | 47,225 sq ft |
| Source record | nyc:6338140:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 135.5 kBtu/ft² | 476 tCO₂e | |
| 2023 | — | 150.6 kBtu/ft² | 466 tCO₂e | |
| 2022 | — | 167.7 kBtu/ft² | 447 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
- 15 West 18th Street
- City
- New York City
- State
- New York
- ZIP
- 10011
- Coordinates
- 40.73885, -73.99260
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Alfa -15 West 18th Street compare with other office buildings in New York City?
The latest disclosures cover 3,384 office buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 135.5 kBtu/ft² is about twice the average of 64.5 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 10.1 kgCO₂e/ft² is about 74% above the group average of 5.8 kgCO₂e/ft².
At 47,225 sq ft, it is about 77% below the average floor area of 205,440 sq ft for those buildings. It was built in 1903, 37 years earlier than the group's average year built (1940). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Alfa -15 West 18th Street's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Alfa -15 West 18th Street, covering report years 2022–2024. Site EUI moved from 167.7 kBtu/ft² (2022) to 135.5 kBtu/ft² (2024), a 19% decrease. Reported emissions went from 447 tCO₂e to 476 tCO₂e over the same span (up 7%).
What does a site EUI of 135.5 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. Alfa -15 West 18th Street's 135.5 kBtu/ft² across 47,225 sq ft works out to about 6.4 billion Btu (1,875 MWh-equivalent) in 2024. Its source EUI of 223.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 643,254 kWh of electricity and 42,019 therms of natural gas for the year.
Which law requires Alfa -15 West 18th Street to report its energy use?
Alfa -15 West 18th 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:6338140:2024). 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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- Ash Management - 927 Flatbush Ave· 47,100 sq ft · score 92 (A)
- 1 Hanover Sq· 47,018 sq ft · score 53 (D)
- 44 W 37th St· 46,947 sq ft · score 79 (B)
- Ash Management - 949 Flatbush Ave· 46,760 sq ft
- Office buildings in New York City· 3,384 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 Alfa -15 West 18th Street's energy grade?
Alfa -15 West 18th Street did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 135.5 kBtu/ft².
How much energy does Alfa -15 West 18th Street use?
Its 2024 site energy-use intensity was 135.5 kBtu/ft² (223.6 kBtu/ft² source) across 47,225 sq ft, including 643,254 kWh of electricity and 42,019 therms of natural gas.
What are Alfa -15 West 18th Street's carbon emissions?
Alfa -15 West 18th Street reported 476 tCO₂e of greenhouse-gas emissions (10.1 kgCO₂e/ft²) for 2024.
Where is Alfa -15 West 18th Street?
Alfa -15 West 18th Street is in New York City, New York 10011. Its coordinates are 40.73885, -73.99260 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Alfa -15 West 18th Street and when was it built?
Alfa -15 West 18th Street has 47,225 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1903 as its year built. It is classed as office.
Is Alfa -15 West 18th 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, “Alfa -15 West 18th Street, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/alfa-15-west-18th-street-bed70fd9 (data as of October 2, 2026).