455 Mass Ave
Office in Washington, DC, DC · 455 Massachusetts Ave NW · 20001
At a glance
455 Mass Ave is a 263,181-square-foot office building at 455 Massachusetts Ave NW in Washington, DC, built in 2008. In its 2024 Washington, DC benchmarking disclosure it reported a site energy-use intensity of 36.7 kBtu/ft² and 847 tCO₂e of greenhouse-gas emissions.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 36.7 kBtu/ft² |
| Source EUI | 102.7 kBtu/ft² |
| GHG emissions | 847 tCO₂e |
| GHG intensity | 3.2 kgCO₂e/ft² |
| Electricity | 2,827,841 kWh |
| Natural gas | 0 therms |
| Water use | 2,696 kgal |
| Gross floor area | 263,181 sq ft |
| Source record | dc:PM2807339:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 36.7 kBtu/ft² | 847 tCO₂e | |
| 2023 | 83 | -5 | 34.6 kBtu/ft² | 819 tCO₂e |
| 2022 | 88 | -1 | 30.5 kBtu/ft² | 700 tCO₂e |
| 2021 | 89 | +6 | 29.5 kBtu/ft² | 700 tCO₂e |
| 2020 | 83 | ±0 | 38.0 kBtu/ft² | 897 tCO₂e |
| 2019 | 83 | +10 | 53.0 kBtu/ft² | 1,282 tCO₂e |
| 2018 | 73 | -11 | 60.5 kBtu/ft² | 1,516 tCO₂e |
| 2017 | 84 | +3 | 62.3 kBtu/ft² | 1,710 tCO₂e |
| 2015 | 81 | +2 | 67.2 kBtu/ft² | 2,225 tCO₂e |
| 2014 | 79 | -4 | 69.1 kBtu/ft² | 2,289 tCO₂e |
| 2013 | 83 | +1 | 65.3 kBtu/ft² | 2,163 tCO₂e |
| 2012 | 82 | 70.8 kBtu/ft² | 2,478 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
SQUARE 516S OFFICE VENTURE LLC
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Location
- Address
- 455 Massachusetts Ave NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20001
- Coordinates
- 38.90105, -77.01756
Within ~1 km
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See also: most efficient in Washington, DC · biggest emitters
How does 455 Mass Ave compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. Its site EUI of 36.7 kBtu/ft² is about 34% 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 3.2 kgCO₂e/ft² is about 36% below the group average of 5.0 kgCO₂e/ft².
At 263,181 sq ft, it is about 22% above the average floor area of 216,135 sq ft for those buildings. It was built in 2008, 34 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 455 Mass Ave's energy performance changed over time?
BuildingCensus holds 12 Washington, DC disclosures for 455 Mass Ave, covering report years 2012, 2013, 2014, 2015, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024. Its ENERGY STAR score went from 82 in 2012 to 83 in 2023 (+1 points); its best year on file was 2021, at 89. Site EUI moved from 70.8 kBtu/ft² (2012) to 36.7 kBtu/ft² (2024), a 48% decrease. Reported emissions went from 2,478 tCO₂e to 847 tCO₂e over the same span (down 66%).
What does a site EUI of 36.7 kBtu/ft² mean?
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. 455 Mass Ave's 36.7 kBtu/ft² across 263,181 sq ft works out to about 9.7 billion Btu (2,831 MWh-equivalent) in 2024. Its source EUI of 102.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,827,841 kWh of electricity, 0 therms of natural gas and 2,696 thousand gallons of water for the year.
Which law requires 455 Mass Ave to report its energy use?
455 Mass Ave 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:PM2807339:2024). 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
- 1150 17th Street· 263,091 sq ft · score 66 (C)
- The Willard Office Building· 262,770 sq ft · score 90 (A)
- 830 First Street NE - Washington· 261,996 sq ft · score 80 (B)
- 1825 K Street· 260,371 sq ft · score 76 (B)
- McPherson Building· 259,335 sq ft · score 74 (B)
- CNBB· 259,162 sq ft · score 69 (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 455 Mass Ave's energy grade?
455 Mass Ave did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 36.7 kBtu/ft².
How much energy does 455 Mass Ave use?
Its 2024 site energy-use intensity was 36.7 kBtu/ft² (102.7 kBtu/ft² source) across 263,181 sq ft, including 2,827,841 kWh of electricity and 0 therms of natural gas.
What are 455 Mass Ave's carbon emissions?
455 Mass Ave reported 847 tCO₂e of greenhouse-gas emissions (3.2 kgCO₂e/ft²) for 2024.
Where is 455 Mass Ave?
455 Mass Ave is at 455 Massachusetts Ave NW, in Washington, DC 20001. Its coordinates are 38.90105, -77.01756 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is 455 Mass Ave and when was it built?
455 Mass Ave has 263,181 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2008 as its year built. It is classed as office.
Is 455 Mass Ave 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, “455 Mass Ave, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/455-mass-ave-450b3147 (data as of July 9, 2026).