Cornerstone: 40 Downing St.
Multifamily Housing in New York City, NY · 40 Downing Street · 10014
At a glance
Cornerstone: 40 Downing St. is a 39,430-square-foot multifamily housing building at 40 Downing Street in New York City, New York, built in 1900. 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 30.3 kBtu/ft² and 95 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 | 30.3 kBtu/ft² |
| Source EUI | 37.9 kBtu/ft² |
| GHG emissions | 95 tCO₂e |
| GHG intensity | 2.4 kgCO₂e/ft² |
| Electricity | 46,849 kWh |
| Natural gas | 126 therms |
| Water use | 20 kgal |
| Gross floor area | 39,430 sq ft |
| Source record | nyc:6808433:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 100 | +1 | 30.3 kBtu/ft² | 95 tCO₂e |
| 2023 | 99 | -1 | 37.0 kBtu/ft² | 114 tCO₂e |
| 2022 | 100 | 37.5 kBtu/ft² | 111 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
- 40 Downing Street
- City
- New York City
- State
- New York
- ZIP
- 10014
- Coordinates
- 40.72919, -74.00410
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Cornerstone: 40 Downing 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. Cornerstone: 40 Downing 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 30.3 kBtu/ft² is about 60% 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 2.4 kgCO₂e/ft² is about half of the group average of 5.2 kgCO₂e/ft².
At 39,430 sq ft, it is about 61% below the average floor area of 100,951 sq ft for those buildings. It was built in 1900, 52 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 Cornerstone: 40 Downing St.'s energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Cornerstone: 40 Downing St., covering report years 2022–2024. Its ENERGY STAR score was 100 in both 2022 and 2024. Site EUI moved from 37.5 kBtu/ft² (2022) to 30.3 kBtu/ft² (2024), a 19% decrease. Reported emissions went from 111 tCO₂e to 95 tCO₂e over the same span (down 15%).
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. Cornerstone: 40 Downing St.'s 30.3 kBtu/ft² across 39,430 sq ft works out to about 1.2 billion Btu (350 MWh-equivalent) in 2024. Its source EUI of 37.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 46,849 kWh of electricity, 126 therms of natural gas and 20 thousand gallons of water for the year.
Which law requires Cornerstone: 40 Downing St. to report its energy use?
Cornerstone: 40 Downing 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:6808433:2024). 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
- 2564 Creston Avenue· 39,425 sq ft · score 60 (C)
- 2665 Valentine Avenue· 39,414 sq ft · score 78 (B)
- Abstract- 1638 8 Avenue· 39,400 sq ft · score 95 (A)
- 754 East 6th Street· 39,400 sq ft · score 31 (D)
- Hygrade Wiper Supply· 39,400 sq ft · score 89 (A)
- Hennessey Realty LLC· 39,400 sq ft · score 17 (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 Cornerstone: 40 Downing St.'s energy grade?
Cornerstone: 40 Downing 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 Cornerstone: 40 Downing St. use?
Its 2024 site energy-use intensity was 30.3 kBtu/ft² (37.9 kBtu/ft² source) across 39,430 sq ft, including 46,849 kWh of electricity and 126 therms of natural gas.
What are Cornerstone: 40 Downing St.'s carbon emissions?
Cornerstone: 40 Downing St. reported 95 tCO₂e of greenhouse-gas emissions (2.4 kgCO₂e/ft²) for 2024.
Where is Cornerstone: 40 Downing St.?
Cornerstone: 40 Downing St. is at 40 Downing Street, in New York City, New York 10014. Its coordinates are 40.72919, -74.00410 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Cornerstone: 40 Downing St. and when was it built?
Cornerstone: 40 Downing St. has 39,430 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1900 as its year built. It is classed as multifamily housing.
Is Cornerstone: 40 Downing 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, “Cornerstone: 40 Downing St., New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/cornerstone-40-downing-st-29ead380 (data as of October 2, 2026).