Onni Atrium Apartments, LP

How does Onni Atrium Apartments, LP 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. Onni Atrium Apartments, LP's ENERGY STAR score of 27 compares with an average of 62 across the 1,472 that report a score; it scores higher than 13% of them and lower than 86%. Its site EUI of 95.5 kBtu/ft² is about 33% above the average of 72.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.6 kgCO₂e/ft² is about 31% above the group average of 5.8 kgCO₂e/ft².

At 147,424 sq ft, it is about 28% below the average floor area of 206,097 sq ft for those buildings. It was built in 1976, 5 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 Onni Atrium Apartments, LP's energy performance changed over time?

BuildingCensus holds 8 Chicago disclosures for Onni Atrium Apartments, LP, covering report years 2016–2023. Its ENERGY STAR score went from 14 in 2016 to 27 in 2023 (+13 points); its best year on file was 2018, at 36. Site EUI moved from 92.6 kBtu/ft² (2016) to 95.5 kBtu/ft² (2023), an 3% increase. Reported emissions went from 1,308 tCO₂e to 1,121 tCO₂e over the same span (down 14%).

What does an ENERGY STAR score of 27 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 27 means the building performs better than about 27% of its national peers. BuildingCensus bands the score into report-card grades; 27 falls in band D — lowest band (1–54). It sits 48 points below 75, the threshold for ENERGY STAR certification. 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. Onni Atrium Apartments, LP's 95.5 kBtu/ft² across 147,424 sq ft works out to about 14.1 billion Btu (4,126 MWh-equivalent) in 2023. Its source EUI of 151.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,261,895 kWh of electricity and 97,659 therms of natural gas for the year.

Which law requires Onni Atrium Apartments, LP to report its energy use?

Onni Atrium Apartments, LP 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:159249:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.