Portner Flats
Multifamily Housing in Washington, DC, DC · 1440 V Street NW · 20009
At a glance
Portner Flats is a 90,982-square-foot multifamily housing building at 1440 V Street NW in Washington, DC, built in 2018. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 57 out of 100 (grade C), a site energy-use intensity of 45.5 kBtu/ft² and 361 tCO₂e of greenhouse-gas emissions. That score is higher than 24% 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 | 57 (band C) |
| Site EUI | 45.5 kBtu/ft² |
| Source EUI | 125.9 kBtu/ft² |
| GHG emissions | 361 tCO₂e |
| GHG intensity | 4.0 kgCO₂e/ft² |
| Electricity | 1,190,721 kWh |
| Natural gas | 792 therms |
| Water use | 3,336 kgal |
| Gross floor area | 90,982 sq ft |
| Source record | dc:PM6786655:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 57 | -5 | 45.5 kBtu/ft² | 361 tCO₂e |
| 2023 | 62 | ±0 | 42.4 kBtu/ft² | 344 tCO₂e |
| 2022 | 62 | +6 | 43.2 kBtu/ft² | 339 tCO₂e |
| 2021 | 56 | +1 | 44.2 kBtu/ft² | 370 tCO₂e |
| 2020 | 55 | 43.6 kBtu/ft² | 376 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
PORTNER FLATS LLC
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Location
- Address
- 1440 V Street NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20009
- Coordinates
- 38.91788, -77.03338
Within ~1 km
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How does Portner Flats 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. Portner Flats's ENERGY STAR score of 57 compares with an average of 72 across the 1,618 that report a score; it scores higher than 24% of them and lower than 75%. Its site EUI of 45.5 kBtu/ft² is about 11% 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 4.0 kgCO₂e/ft² is roughly in line with the group average of 3.8 kgCO₂e/ft².
At 90,982 sq ft, it is about 33% below the average floor area of 136,346 sq ft for those buildings. It was built in 2018, 53 years later 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 Portner Flats's energy performance changed over time?
BuildingCensus holds 5 Washington, DC disclosures for Portner Flats, covering report years 2020–2024. Its ENERGY STAR score went from 55 in 2020 to 57 in 2024 (+2 points); its best year on file was 2022, at 62. Site EUI moved from 43.6 kBtu/ft² (2020) to 45.5 kBtu/ft² (2024), an 4% increase. Reported emissions went from 376 tCO₂e to 361 tCO₂e over the same span (down 4%).
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 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. Portner Flats's 45.5 kBtu/ft² across 90,982 sq ft works out to about 4.1 billion Btu (1,213 MWh-equivalent) in 2024. Its source EUI of 125.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,190,721 kWh of electricity, 792 therms of natural gas and 3,336 thousand gallons of water for the year.
Which law requires Portner Flats to report its energy use?
Portner Flats 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:PM6786655:2024). 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.
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Frequently asked questions
What is Portner Flats's energy grade?
Portner Flats scores 57 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Portner Flats use?
Its 2024 site energy-use intensity was 45.5 kBtu/ft² (125.9 kBtu/ft² source) across 90,982 sq ft, including 1,190,721 kWh of electricity and 792 therms of natural gas.
What are Portner Flats's carbon emissions?
Portner Flats reported 361 tCO₂e of greenhouse-gas emissions (4.0 kgCO₂e/ft²) for 2024.
Where is Portner Flats?
Portner Flats is at 1440 V Street NW, in Washington, DC 20009. Its coordinates are 38.91788, -77.03338 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Portner Flats and when was it built?
Portner Flats has 90,982 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2018 as its year built. It is classed as multifamily housing.
Is Portner Flats 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, “Portner Flats, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/portner-flats-373ced28 (data as of July 9, 2026).