Imperial House Condominium

How does Imperial House Condominium 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. Imperial House Condominium's ENERGY STAR score of 84 compares with an average of 72 across the 1,618 that report a score; it scores higher than 57% of them and lower than 41%. Its site EUI of 65.8 kBtu/ft² is about 29% above the average of 51.1 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 4.4 kgCO₂e/ft² is about 16% above the group average of 3.8 kgCO₂e/ft².

At 109,705 sq ft, it is about 20% below the average floor area of 136,346 sq ft for those buildings. It was built in 1962, 3 years earlier 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 Imperial House Condominium's energy performance changed over time?

BuildingCensus holds 10 Washington, DC disclosures for Imperial House Condominium, covering report years 2014–2023. Its ENERGY STAR score went from 66 in 2014 to 84 in 2023 (+18 points); its best year on file was 2018, at 91. Site EUI moved from 90.7 kBtu/ft² (2014) to 65.8 kBtu/ft² (2023), a 27% decrease. Reported emissions went from 725 tCO₂e to 481 tCO₂e over the same span (down 34%).

What does an ENERGY STAR score of 84 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 84 means the building performs better than about 84% of its national peers. BuildingCensus bands the score into report-card grades; 84 falls in band B — above median (70–84). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. Imperial House Condominium's 65.8 kBtu/ft² across 109,705 sq ft works out to about 7.2 billion Btu (2,116 MWh-equivalent) in 2023. Its source EUI of 111.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 781,200 kWh of electricity, 45,493 therms of natural gas and 5,080 thousand gallons of water for the year.

Which law requires Imperial House Condominium to report its energy use?

Imperial House Condominium 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 2023 disclosure (source record dc:PM3698501:2023). 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.