ATU 21 Dupont
Office in Washington, DC, DC · 21 Dupont Cir NW · 20036
At a glance
ATU 21 Dupont is a 55,818-square-foot office building at 21 Dupont Cir NW in Washington, DC, built in 1971. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 26 out of 100 (grade D), a site energy-use intensity of 101.1 kBtu/ft² and 423 tCO₂e of greenhouse-gas emissions. That score is higher than 5% of the 774 scored office buildings in Washington, DC.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 26 (band D) |
| Site EUI | 101.1 kBtu/ft² |
| Source EUI | 217.2 kBtu/ft² |
| GHG emissions | 423 tCO₂e |
| GHG intensity | 7.6 kgCO₂e/ft² |
| Electricity | 1,037,341 kWh |
| Natural gas | 21,061 therms |
| Water use | 314 kgal |
| Gross floor area | 55,818 sq ft |
| Source record | dc:PM3997827:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 26 | +2 | 101.1 kBtu/ft² | 423 tCO₂e |
| 2023 | 24 | ±0 | 101.4 kBtu/ft² | 434 tCO₂e |
| 2022 | 24 | +8 | 106.4 kBtu/ft² | 439 tCO₂e |
| 2021 | 16 | -9 | 108.0 kBtu/ft² | 454 tCO₂e |
| 2020 | 25 | +11 | 110.4 kBtu/ft² | 492 tCO₂e |
| 2019 | 14 | -10 | 136.4 kBtu/ft² | 615 tCO₂e |
| 2018 | 24 | -5 | 113.0 kBtu/ft² | 522 tCO₂e |
| 2017 | 29 | +1 | 105.1 kBtu/ft² | 558 tCO₂e |
| 2016 | 28 | +7 | 113.5 kBtu/ft² | 597 tCO₂e |
| 2015 | 21 | -3 | 129.3 kBtu/ft² | 744 tCO₂e |
| 2014 | 24 | +2 | 117.8 kBtu/ft² | 708 tCO₂e |
| 2013 | 22 | 129.4 kBtu/ft² | 703 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
ATU DUPONT CIRCLE, LLC
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Location
- Address
- 21 Dupont Cir NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20036
- Coordinates
- 38.90884, -77.04378
Within ~1 km
Nearby benchmarked buildings
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- DUPONT HOTEL PROJECT OWNER LLCscore 46
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- Washington Hilton (DCAWH)score 93
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- Washington Hiltonscore 42
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- HLT Washington DC-SVscore 73
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See also: most efficient in Washington, DC · biggest emitters
How does ATU 21 Dupont compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. ATU 21 Dupont's ENERGY STAR score of 26 compares with an average of 70 across the 774 that report a score; it scores higher than 5% of them and lower than 95%. Its site EUI of 101.1 kBtu/ft² is about 82% above the average of 55.6 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.6 kgCO₂e/ft² is about 51% above the group average of 5.0 kgCO₂e/ft².
At 55,818 sq ft, it is about 74% below the average floor area of 216,135 sq ft for those buildings. It was built in 1971, 3 years earlier than the group's average year built (1974). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has ATU 21 Dupont's energy performance changed over time?
BuildingCensus holds 12 Washington, DC disclosures for ATU 21 Dupont, covering report years 2013–2024. Its ENERGY STAR score went from 22 in 2013 to 26 in 2024 (+4 points); its best year on file was 2017, at 29. Site EUI moved from 129.4 kBtu/ft² (2013) to 101.1 kBtu/ft² (2024), a 22% decrease. Reported emissions went from 703 tCO₂e to 423 tCO₂e over the same span (down 40%).
What does an ENERGY STAR score of 26 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 26 means the building performs better than about 26% of its national peers. BuildingCensus bands the score into report-card grades; 26 falls in band D — lowest band (1–54). It sits 49 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. ATU 21 Dupont's 101.1 kBtu/ft² across 55,818 sq ft works out to about 5.6 billion Btu (1,654 MWh-equivalent) in 2024. Its source EUI of 217.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,037,341 kWh of electricity, 21,061 therms of natural gas and 314 thousand gallons of water for the year.
Which law requires ATU 21 Dupont to report its energy use?
ATU 21 Dupont 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:PM3997827:2024). 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 office buildings in Washington, DC
- Duke Ellington Building· 55,474 sq ft · score 63 (C)
- Ellington Building· 55,474 sq ft · score 100 (A)
- The Sunderland· 55,193 sq ft · score 64 (C)
- National Capital Bank Office Building· 55,170 sq ft · score 74 (B)
- RHODIUM, LLC· 55,159 sq ft · score 22 (D)
- NAB· 55,000 sq ft · score 24 (D)
- Office buildings in Washington, DC· 899 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 ATU 21 Dupont's energy grade?
ATU 21 Dupont scores 26 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does ATU 21 Dupont use?
Its 2024 site energy-use intensity was 101.1 kBtu/ft² (217.2 kBtu/ft² source) across 55,818 sq ft, including 1,037,341 kWh of electricity and 21,061 therms of natural gas.
What are ATU 21 Dupont's carbon emissions?
ATU 21 Dupont reported 423 tCO₂e of greenhouse-gas emissions (7.6 kgCO₂e/ft²) for 2024.
Where is ATU 21 Dupont?
ATU 21 Dupont is at 21 Dupont Cir NW, in Washington, DC 20036. Its coordinates are 38.90884, -77.04378 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is ATU 21 Dupont and when was it built?
ATU 21 Dupont has 55,818 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1971 as its year built. It is classed as office.
Is ATU 21 Dupont 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, “ATU 21 Dupont, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/atu-21-dupont-c43255a9 (data as of July 9, 2026).