800 Connecticut Ave. NW
Office in Washington, DC, DC · 20006
At a glance
800 Connecticut Ave. NW is a 149,579-square-foot office building in Washington, DC, built in 1991. 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 57.0 kBtu/ft² and 679 tCO₂e of greenhouse-gas emissions. That score is higher than 21% 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 | 57 (band C) |
| Site EUI | 57.0 kBtu/ft² |
| Source EUI | 159.5 kBtu/ft² |
| GHG emissions | 679 tCO₂e |
| GHG intensity | 4.5 kgCO₂e/ft² |
| Electricity | 2,497,876 kWh |
| Natural gas | 0 therms |
| Water use | 1,979 kgal |
| Gross floor area | 149,579 sq ft |
| Source record | dc:PM2015806:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 57 | -2 | 57.0 kBtu/ft² | 679 tCO₂e |
| 2023 | 59 | -11 | 60.0 kBtu/ft² | 760 tCO₂e |
| 2022 | 70 | +8 | 49.6 kBtu/ft² | 667 tCO₂e |
| 2021 | 62 | ±0 | 53.1 kBtu/ft² | 714 tCO₂e |
| 2020 | 62 | +13 | 53.5 kBtu/ft² | 697 tCO₂e |
| 2019 | 49 | +4 | 64.6 kBtu/ft² | 897 tCO₂e |
| 2018 | 45 | -8 | 68.4 kBtu/ft² | 982 tCO₂e |
| 2017 | 53 | -2 | 75.9 kBtu/ft² | 1,061 tCO₂e |
| 2016 | 55 | -10 | 75.5 kBtu/ft² | 1,090 tCO₂e |
| 2015 | 65 | ±0 | 67.8 kBtu/ft² | 1,143 tCO₂e |
| 2014 | 65 | 67.8 kBtu/ft² | 1,143 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
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 800 Connecticut Ave. NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20006
- Coordinates
- 38.90049, -77.03857
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
- 1300 Buildingscore 95
Bank/Financial Institution · 803,167 sq ft
- NGS Headquartersscore 68
Office · 746,237 sq ft
See also: most efficient in Washington, DC · biggest emitters
How does 800 Connecticut Ave. NW compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. 800 Connecticut Ave. NW's ENERGY STAR score of 57 compares with an average of 70 across the 774 that report a score; it scores higher than 21% of them and lower than 79%. Its site EUI of 57.0 kBtu/ft² is roughly in line with the average of 55.6 kBtu/ft². Its emissions intensity of 4.5 kgCO₂e/ft² is roughly in line with the group average of 5.0 kgCO₂e/ft².
At 149,579 sq ft, it is about 31% below the average floor area of 216,135 sq ft for those buildings. It was built in 1991, 17 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 800 Connecticut Ave. NW's energy performance changed over time?
BuildingCensus holds 11 Washington, DC disclosures for 800 Connecticut Ave. NW, covering report years 2014–2024. Its ENERGY STAR score went from 65 in 2014 to 57 in 2024 (-8 points); its best year on file was 2022, at 70. Site EUI moved from 67.8 kBtu/ft² (2014) to 57.0 kBtu/ft² (2024), a 16% decrease. Reported emissions went from 1,143 tCO₂e to 679 tCO₂e over the same span (down 41%).
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. 800 Connecticut Ave. NW's 57.0 kBtu/ft² across 149,579 sq ft works out to about 8.5 billion Btu (2,499 MWh-equivalent) in 2024. Its source EUI of 159.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,497,876 kWh of electricity, 0 therms of natural gas and 1,979 thousand gallons of water for the year.
Which law requires 800 Connecticut Ave. NW to report its energy use?
800 Connecticut Ave. NW 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:PM2015806:2024). 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
- New South· 149,435 sq ft · score 52 (D)
- Portrait Building· 149,062 sq ft · score 98 (A)
- 888 16th Street NW· 148,104 sq ft · score 70 (B)
- 1100 17th Street NW· 147,483 sq ft · score 88 (A)
- Georgetown Plaza (DDOE)· 147,314 sq ft · score 85 (A)
- 0166-0032 1701 PENN· 147,073 sq ft · score 67 (C)
- 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 800 Connecticut Ave. NW's energy grade?
800 Connecticut Ave. NW 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 800 Connecticut Ave. NW use?
Its 2024 site energy-use intensity was 57.0 kBtu/ft² (159.5 kBtu/ft² source) across 149,579 sq ft, including 2,497,876 kWh of electricity and 0 therms of natural gas.
What are 800 Connecticut Ave. NW's carbon emissions?
800 Connecticut Ave. NW reported 679 tCO₂e of greenhouse-gas emissions (4.5 kgCO₂e/ft²) for 2024.
Where is 800 Connecticut Ave. NW?
800 Connecticut Ave. NW is in Washington, DC 20006. Its coordinates are 38.90049, -77.03857 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 800 Connecticut Ave. NW and when was it built?
800 Connecticut Ave. NW has 149,579 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1991 as its year built. It is classed as office.
Is 800 Connecticut Ave. NW 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, “800 Connecticut Ave. NW, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/800-connecticut-ave-nw-ec5f8268 (data as of July 9, 2026).