1155 Connecticut Avenue
Office in Washington, DC, DC · 1155 Connecticut Avenue, NW · 20036
At a glance
1155 Connecticut Avenue is a 116,970-square-foot office building at 1155 Connecticut Avenue, NW in Washington, DC, built in 1984. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 73 out of 100 (grade B), a site energy-use intensity of 48.2 kBtu/ft² and 495 tCO₂e of greenhouse-gas emissions. That score is higher than 43% 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 | 73 (band B) |
| Site EUI | 48.2 kBtu/ft² |
| Source EUI | 135.1 kBtu/ft² |
| GHG emissions | 495 tCO₂e |
| GHG intensity | 4.2 kgCO₂e/ft² |
| Electricity | 1,653,570 kWh |
| Natural gas | 0 therms |
| Water use | 1,265 kgal |
| Gross floor area | 116,970 sq ft |
| Source record | dc:PM1419646:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 73 | +5 | 48.2 kBtu/ft² | 495 tCO₂e |
| 2023 | 68 | -4 | 50.6 kBtu/ft² | 531 tCO₂e |
| 2022 | 72 | +1 | 49.8 kBtu/ft² | 523 tCO₂e |
| 2021 | 71 | -9 | 41.8 kBtu/ft² | 420 tCO₂e |
| 2020 | 80 | +17 | 42.9 kBtu/ft² | 443 tCO₂e |
| 2019 | 63 | +1 | 55.2 kBtu/ft² | 571 tCO₂e |
| 2018 | 62 | -13 | 56.9 kBtu/ft² | 588 tCO₂e |
| 2017 | 75 | +27 | 53.5 kBtu/ft² | 640 tCO₂e |
| 2016 | 48 | -7 | 71.7 kBtu/ft² | 823 tCO₂e |
| 2015 | 55 | -1 | 60.4 kBtu/ft² | 850 tCO₂e |
| 2014 | 56 | 61.6 kBtu/ft² | 891 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
1155 CONNECTICUT AVENUE INC
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Location
- Address
- 1155 Connecticut Avenue, NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20036
- Coordinates
- 38.90545, -77.04039
Within ~1 km
Nearby benchmarked buildings
- Main Complexscore 59
Office · 1,872,507 sq ft
- International Squarescore 56
Office · 1,233,833 sq ft
- Midtown Centerscore 91
Office · 911,093 sq ft
- Lafayette Centrescore 74
Office · 908,482 sq ft
- NGS Headquartersscore 68
Office · 746,237 sq ft
- Northwestern Buildingscore 90
Office · 732,964 sq ft
See also: most efficient in Washington, DC · biggest emitters
How does 1155 Connecticut Avenue compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. 1155 Connecticut Avenue's ENERGY STAR score of 73 compares with an average of 70 across the 774 that report a score; it scores higher than 43% of them and lower than 54%. Its site EUI of 48.2 kBtu/ft² is about 13% below the average of 55.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.2 kgCO₂e/ft² is about 15% below the group average of 5.0 kgCO₂e/ft².
At 116,970 sq ft, it is about half of the average floor area of 216,135 sq ft for those buildings. It was built in 1984, 10 years later 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 1155 Connecticut Avenue's energy performance changed over time?
BuildingCensus holds 11 Washington, DC disclosures for 1155 Connecticut Avenue, covering report years 2014–2024. Its ENERGY STAR score went from 56 in 2014 to 73 in 2024 (+17 points); its best year on file was 2020, at 80. Site EUI moved from 61.6 kBtu/ft² (2014) to 48.2 kBtu/ft² (2024), a 22% decrease. Reported emissions went from 891 tCO₂e to 495 tCO₂e over the same span (down 44%).
What does an ENERGY STAR score of 73 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 73 means the building performs better than about 73% of its national peers. BuildingCensus bands the score into report-card grades; 73 falls in band B — above median (70–84). It sits 2 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. 1155 Connecticut Avenue's 48.2 kBtu/ft² across 116,970 sq ft works out to about 5.6 billion Btu (1,652 MWh-equivalent) in 2024. Its source EUI of 135.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,653,570 kWh of electricity, 0 therms of natural gas and 1,265 thousand gallons of water for the year.
Which law requires 1155 Connecticut Avenue to report its energy use?
1155 Connecticut Avenue 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:PM1419646:2024). 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
- Barr Building· 116,813 sq ft · score 85 (A)
- 1015 18th Street· 116,684 sq ft · score 83 (B)
- Prudence, LLC· 116,317 sq ft · score 73 (B)
- 1707 L Street· 115,882 sq ft · score 89 (A)
- 2121 Wisconsin Ave· 115,803 sq ft · score 78 (B)
- American Chemical Society - Headquarters· 115,470 sq ft · score 78 (B)
- 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 1155 Connecticut Avenue's energy grade?
1155 Connecticut Avenue scores 73 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 1155 Connecticut Avenue use?
Its 2024 site energy-use intensity was 48.2 kBtu/ft² (135.1 kBtu/ft² source) across 116,970 sq ft, including 1,653,570 kWh of electricity and 0 therms of natural gas.
What are 1155 Connecticut Avenue's carbon emissions?
1155 Connecticut Avenue reported 495 tCO₂e of greenhouse-gas emissions (4.2 kgCO₂e/ft²) for 2024.
Where is 1155 Connecticut Avenue?
1155 Connecticut Avenue is at 1155 Connecticut Avenue, NW, in Washington, DC 20036. Its coordinates are 38.90545, -77.04039 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 1155 Connecticut Avenue and when was it built?
1155 Connecticut Avenue has 116,970 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1984 as its year built. It is classed as office.
Is 1155 Connecticut Avenue 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, “1155 Connecticut Avenue, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/1155-connecticut-avenue-fca5e60e (data as of July 9, 2026).