Mayfair Mansions Apartments III

How does Mayfair Mansions Apartments III 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. Mayfair Mansions Apartments III's ENERGY STAR score of 44 compares with an average of 72 across the 1,618 that report a score; it scores higher than 14% of them and lower than 85%. Its site EUI of 39.0 kBtu/ft² is about 24% below the average of 51.1 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 3.1 kgCO₂e/ft² is about 18% below the group average of 3.8 kgCO₂e/ft².

At 136,528 sq ft, it is roughly in line with the average floor area of 136,346 sq ft for those buildings. It was built in 1945, 20 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.

What does an ENERGY STAR score of 44 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 44 means the building performs better than about 44% of its national peers. BuildingCensus bands the score into report-card grades; 44 falls in band D — lowest band (1–54). It sits 31 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. Mayfair Mansions Apartments III's 39.0 kBtu/ft² across 136,528 sq ft works out to about 5.3 billion Btu (1,560 MWh-equivalent) in 2024. Its source EUI of 109.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,561,916 kWh of electricity, 0 therms of natural gas and 11,866 thousand gallons of water for the year.

Which law requires Mayfair Mansions Apartments III to report its energy use?

Mayfair Mansions Apartments III 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:PM34394148:2024). 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.