Mayfair Commons

How does Mayfair Commons compare with other multifamily housing buildings in Chicago?

The latest disclosures cover 1,515 multifamily housing buildings in Chicago, out of 3,852 buildings citywide. Mayfair Commons's ENERGY STAR score of 86 compares with an average of 62 across the 1,472 that report a score; it scores higher than 75% of them and lower than 24%. Its site EUI of 73.2 kBtu/ft² is roughly in line with the average of 72.0 kBtu/ft². Its emissions intensity of 5.2 kgCO₂e/ft² is about 10% below the group average of 5.8 kgCO₂e/ft².

At 84,456 sq ft, it is about 59% below the average floor area of 206,097 sq ft for those buildings. It was built in 1997, 26 years later than the group's average year built (1971). 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 Mayfair Commons's energy performance changed over time?

BuildingCensus holds 8 Chicago disclosures for Mayfair Commons, covering report years 2016–2023. Its ENERGY STAR score went from 70 in 2016 to 86 in 2023 (+16 points); its best year on file was 2017, at 89. Site EUI moved from 90.1 kBtu/ft² (2016) to 73.2 kBtu/ft² (2023), a 19% decrease. Reported emissions went from 613 tCO₂e to 436 tCO₂e over the same span (down 29%).

What does an ENERGY STAR score of 86 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 86 means the building performs better than about 86% of its national peers. BuildingCensus bands the score into report-card grades; 86 falls in band A — high performer (85–100). 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 Chicago, 35% 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 Commons's 73.2 kBtu/ft² across 84,456 sq ft works out to about 6.2 billion Btu (1,812 MWh-equivalent) in 2023. Its source EUI of 102.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 364,256 kWh of electricity and 49,353 therms of natural gas for the year.

Which law requires Mayfair Commons to report its energy use?

Mayfair Commons reports under the Building Energy Use Benchmarking Ordinance, the legal basis of the Chicago Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record chicago:117174:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.