Dexter House
Residence Hall/Dormitory in New York City, NY · 345 W 86th St · 10024
At a glance
Dexter House is a 78,071-square-foot residence hall/dormitory at 345 W 86th St in New York City, New York, built in 1923. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 57 out of 100 (grade C), a site energy-use intensity of 107.5 kBtu/ft² and 554 tCO₂e of greenhouse-gas emissions. That score is higher than 29% of the 177 scored residence hall/dormitory buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 57 (band C) |
| Site EUI | 107.5 kBtu/ft² |
| Source EUI | 151.9 kBtu/ft² |
| GHG emissions | 554 tCO₂e |
| GHG intensity | 7.1 kgCO₂e/ft² |
| Electricity | 510,890 kWh |
| Natural gas | 66,468 therms |
| Water use | 8,819 kgal |
| Gross floor area | 78,071 sq ft |
| Source record | nyc:11662830:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 57 | -3 | 107.5 kBtu/ft² | 554 tCO₂e |
| 2023 | 60 | -9 | 100.9 kBtu/ft² | 515 tCO₂e |
| 2022 | 69 | 96.4 kBtu/ft² | 456 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
- 345 W 86th St
- City
- New York City
- State
- New York
- ZIP
- 10024
- Coordinates
- 40.78977, -73.97994
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Dexter House compare with other residence hall/dormitory buildings in New York City?
The latest disclosures cover 343 residence hall/dormitory buildings in New York City, out of 48,310 buildings citywide. Dexter House's ENERGY STAR score of 57 compares with an average of 69 across the 177 that report a score; it scores higher than 29% of them and lower than 68%. Its site EUI of 107.5 kBtu/ft² is about 35% above the average of 79.6 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.1 kgCO₂e/ft² is about 29% above the group average of 5.5 kgCO₂e/ft².
At 78,071 sq ft, it is roughly in line with the average floor area of 85,583 sq ft for those buildings. It was built in 1923, 23 years earlier than the group's average year built (1947). Across all 24 jurisdictions BuildingCensus covers, the 702 residence hall/dormitory buildings average an ENERGY STAR score of 70 and a site EUI of 70.7 kBtu/ft².
How has Dexter House's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Dexter House, covering report years 2022–2024. Its ENERGY STAR score went from 69 in 2022 to 57 in 2024 (-12 points); its best year on file was 2022, at 69. Site EUI moved from 96.4 kBtu/ft² (2022) to 107.5 kBtu/ft² (2024), an 12% increase. Reported emissions went from 456 tCO₂e to 554 tCO₂e over the same span (up 21%).
What does an ENERGY STAR score of 57 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 57 means the building performs better than about 57% of its national peers. BuildingCensus bands the score into report-card grades; 57 falls in band C — below median (55–69). It sits 18 points below 75, the threshold for ENERGY STAR certification. 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. Dexter House's 107.5 kBtu/ft² across 78,071 sq ft works out to about 8.4 billion Btu (2,460 MWh-equivalent) in 2024. Its source EUI of 151.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 510,890 kWh of electricity, 66,468 therms of natural gas and 8,819 thousand gallons of water for the year.
Which law requires Dexter House to report its energy use?
Dexter House 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:11662830:2024). 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 residence hall/dormitory buildings in New York City
- Brooks Hall· 77,505 sq ft · score 1 (D)
- 97 Columbia Heights· 77,088 sq ft
- Stratford Arms Hotel - 117 West 70th St· 76,448 sq ft · score 61 (C)
- 47 West 13th Street AKA 48 West 14th Street· 75,195 sq ft · score 51 (D)
- Emerson Res Hall· 75,000 sq ft · score 77 (B)
- 15 Washington Place· 73,733 sq ft · score 90 (A)
- Residence Hall/Dormitory buildings in New York City· 343 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 Dexter House's energy grade?
Dexter House scores 57 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Dexter House use?
Its 2024 site energy-use intensity was 107.5 kBtu/ft² (151.9 kBtu/ft² source) across 78,071 sq ft, including 510,890 kWh of electricity and 66,468 therms of natural gas.
What are Dexter House's carbon emissions?
Dexter House reported 554 tCO₂e of greenhouse-gas emissions (7.1 kgCO₂e/ft²) for 2024.
Where is Dexter House?
Dexter House is at 345 W 86th St, in New York City, New York 10024. Its coordinates are 40.78977, -73.97994 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Dexter House and when was it built?
Dexter House has 78,071 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1923 as its year built. It is classed as residence hall/dormitory.
Is Dexter House 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, “Dexter House, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/dexter-house-7bf7af8a (data as of October 2, 2026).