23-18 31 Street
Medical Office in New York City, NY · 11105
At a glance
23-18 31 Street is a 41,348-square-foot medical office in New York City, New York, built in 1999. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 81 out of 100 (grade B), a site energy-use intensity of 101.4 kBtu/ft² and 393 tCO₂e of greenhouse-gas emissions. That score is higher than 56% of the 147 scored medical office buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 81 (band B) |
| Site EUI | 101.4 kBtu/ft² |
| Source EUI | 236.2 kBtu/ft² |
| GHG emissions | 393 tCO₂e |
| GHG intensity | 9.5 kgCO₂e/ft² |
| Electricity | 898,571 kWh |
| Natural gas | 11,255 therms |
| Gross floor area | 41,348 sq ft |
| Source record | nyc:6863503:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 81 | +6 | 101.4 kBtu/ft² | 393 tCO₂e |
| 2022 | 75 | 119.3 kBtu/ft² | 331 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
- 23-18 31 Street
- City
- New York City
- State
- New York
- ZIP
- 11105
- Coordinates
- 40.77393, -73.91341
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 23-18 31 Street compare with other medical office buildings in New York City?
The latest disclosures cover 188 medical office buildings in New York City, out of 48,310 buildings citywide. 23-18 31 Street's ENERGY STAR score of 81 compares with an average of 65 across the 147 that report a score; it scores higher than 56% of them and lower than 44%. Its site EUI of 101.4 kBtu/ft² is roughly in line with the average of 97.6 kBtu/ft². Its emissions intensity of 9.5 kgCO₂e/ft² is roughly in line with the group average of 8.8 kgCO₂e/ft².
At 41,348 sq ft, it is about 45% below the average floor area of 75,019 sq ft for those buildings. It was built in 1999, 34 years later than the group's average year built (1965). Across all 24 jurisdictions BuildingCensus covers, the 1,266 medical office buildings average an ENERGY STAR score of 64 and a site EUI of 92.2 kBtu/ft².
How has 23-18 31 Street's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for 23-18 31 Street, covering report years 2022–2023. Its ENERGY STAR score went from 75 in 2022 to 81 in 2023 (+6 points). Site EUI moved from 119.3 kBtu/ft² (2022) to 101.4 kBtu/ft² (2023), a 15% decrease. Reported emissions went from 331 tCO₂e to 393 tCO₂e over the same span (up 19%).
What does an ENERGY STAR score of 81 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 81 means the building performs better than about 81% of its national peers. BuildingCensus bands the score into report-card grades; 81 falls in band B — above median (70–84). 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. 23-18 31 Street's 101.4 kBtu/ft² across 41,348 sq ft works out to about 4.2 billion Btu (1,229 MWh-equivalent) in 2023. Its source EUI of 236.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 898,571 kWh of electricity and 11,255 therms of natural gas for the year.
Which law requires 23-18 31 Street to report its energy use?
23-18 31 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 2023 disclosure (source record nyc:6863503:2023). 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 medical office buildings in New York City
- 2315 Broadway· 41,284 sq ft · score 1 (D)
- 250 West 84 Street· 41,284 sq ft · score 1 (D)
- 163-03 Horace Harding Expressway· 41,000 sq ft · score 50 (D)
- 2236 Nostrand Avenue· 40,582 sq ft · score 4 (D)
- Children's Aid - 910 E. 172nd St.· 40,000 sq ft · score 79 (B)
- COE Property Management:1976 CROTONA LLC· 38,899 sq ft · score 97 (A)
- Medical Office buildings in New York City· 188 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 23-18 31 Street's energy grade?
23-18 31 Street scores 81 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 23-18 31 Street use?
Its 2023 site energy-use intensity was 101.4 kBtu/ft² (236.2 kBtu/ft² source) across 41,348 sq ft, including 898,571 kWh of electricity and 11,255 therms of natural gas.
What are 23-18 31 Street's carbon emissions?
23-18 31 Street reported 393 tCO₂e of greenhouse-gas emissions (9.5 kgCO₂e/ft²) for 2023.
Where is 23-18 31 Street?
23-18 31 Street is in New York City, New York 11105. Its coordinates are 40.77393, -73.91341 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 23-18 31 Street and when was it built?
23-18 31 Street has 41,348 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1999 as its year built. It is classed as medical office.
Is 23-18 31 Street covered by Local Law 84 (LL84)?
Yes — it appears in the 2023 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, “23-18 31 Street, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/23-18-31-street-be58c435 (data as of October 2, 2026).