PORTSMOUTH CONDOMINIUM
Multifamily Housing in Washington, DC, DC · 1735 New Hampshire Ave NW · 20009
At a glance
PORTSMOUTH CONDOMINIUM is a 47,638-square-foot multifamily housing building at 1735 New Hampshire Ave NW in Washington, DC, built in 1908. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 36.1 kBtu/ft² and 124 tCO₂e of greenhouse-gas emissions. That score is higher than 76% of the 1,618 scored multifamily housing buildings in Washington, DC.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 93 (band A) |
| Site EUI | 36.1 kBtu/ft² |
| Source EUI | 72.5 kBtu/ft² |
| GHG emissions | 124 tCO₂e |
| GHG intensity | 2.6 kgCO₂e/ft² |
| Electricity | 275,445 kWh |
| Natural gas | 7,822 therms |
| Water use | 1,398 kgal |
| Gross floor area | 47,638 sq ft |
| Source record | dc:PM19393404:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 93 | +7 | 36.1 kBtu/ft² | 124 tCO₂e |
| 2023 | 86 | -3 | 41.6 kBtu/ft² | 137 tCO₂e |
| 2022 | 89 | 41.1 kBtu/ft² | 139 tCO₂e |
Compliance context
Clean and Affordable Energy Act / BEPS
DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
Ownership
THE PORTSMOUTH CONDO
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Location
- Address
- 1735 New Hampshire Ave NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20009
- Coordinates
- 38.91357, -77.03924
Within ~1 km
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See also: most efficient in Washington, DC · biggest emitters
How does PORTSMOUTH CONDOMINIUM compare with other multifamily housing buildings in Washington, DC?
The latest disclosures cover 1,799 multifamily housing buildings in Washington, DC, out of 6,870 buildings citywide. PORTSMOUTH CONDOMINIUM's ENERGY STAR score of 93 compares with an average of 72 across the 1,618 that report a score; it scores higher than 76% of them and lower than 22%. Its site EUI of 36.1 kBtu/ft² is about 29% below the average of 51.1 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.6 kgCO₂e/ft² is about 32% below the group average of 3.8 kgCO₂e/ft².
At 47,638 sq ft, it is about 65% below the average floor area of 136,346 sq ft for those buildings. It was built in 1908, 57 years earlier than the group's average year built (1965). 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 PORTSMOUTH CONDOMINIUM's energy performance changed over time?
BuildingCensus holds 3 Washington, DC disclosures for PORTSMOUTH CONDOMINIUM, covering report years 2022–2024. Its ENERGY STAR score went from 89 in 2022 to 93 in 2024 (+4 points). Site EUI moved from 41.1 kBtu/ft² (2022) to 36.1 kBtu/ft² (2024), a 12% decrease. Reported emissions went from 139 tCO₂e to 124 tCO₂e over the same span (down 11%).
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 Washington, DC, 47% 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. PORTSMOUTH CONDOMINIUM's 36.1 kBtu/ft² across 47,638 sq ft works out to about 1.7 billion Btu (504 MWh-equivalent) in 2024. Its source EUI of 72.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 275,445 kWh of electricity, 7,822 therms of natural gas and 1,398 thousand gallons of water for the year.
Which law requires PORTSMOUTH CONDOMINIUM to report its energy use?
PORTSMOUTH CONDOMINIUM reports under the Clean and Affordable Energy Act / BEPS, the legal basis of Washington, DC's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record dc:PM19393404:2024). DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
More multifamily housing buildings in Washington, DC
- Hilltop Apartments, Building 2· 47,430 sq ft · score 88 (A)
- New Quin - 3800 New Hampshire· 47,277 sq ft · score 57 (C)
- Stoneridge II (st494)· 47,216 sq ft · score 82 (B)
- The Bentley· 47,161 sq ft · score 78 (B)
- Buchanan School Condominium· 47,042 sq ft · score 29 (D)
- Claypoole Courts - 1432 (cl230)· 47,004 sq ft · score 88 (A)
- Multifamily Housing buildings in Washington, DC· 1,799 benchmarked
- All Washington, DC benchmarked buildings· Clean and Affordable Energy Act / BEPS
- Most efficient large buildings in Washington, DC
- Least efficient large buildings in Washington, DC
- Biggest emitters in Washington, DC
Frequently asked questions
What is PORTSMOUTH CONDOMINIUM's energy grade?
PORTSMOUTH CONDOMINIUM scores 93 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does PORTSMOUTH CONDOMINIUM use?
Its 2024 site energy-use intensity was 36.1 kBtu/ft² (72.5 kBtu/ft² source) across 47,638 sq ft, including 275,445 kWh of electricity and 7,822 therms of natural gas.
What are PORTSMOUTH CONDOMINIUM's carbon emissions?
PORTSMOUTH CONDOMINIUM reported 124 tCO₂e of greenhouse-gas emissions (2.6 kgCO₂e/ft²) for 2024.
Where is PORTSMOUTH CONDOMINIUM?
PORTSMOUTH CONDOMINIUM is at 1735 New Hampshire Ave NW, in Washington, DC 20009. Its coordinates are 38.91357, -77.03924 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is PORTSMOUTH CONDOMINIUM and when was it built?
PORTSMOUTH CONDOMINIUM has 47,638 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1908 as its year built. It is classed as multifamily housing.
Is PORTSMOUTH CONDOMINIUM covered by the Clean and Affordable Energy Act / BEPS?
Yes — it appears in the 2024 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Clean and Affordable Energy Act / BEPS.
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About this data
Source: Building Energy Benchmarking (Clean and Affordable Energy Act / BEPS), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “PORTSMOUTH CONDOMINIUM, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/portsmouth-condominium-191d84ec (data as of July 9, 2026).