100 W. Chestnut St.

How does 100 W. Chestnut St. 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. 100 W. Chestnut St.'s ENERGY STAR score of 91 compares with an average of 62 across the 1,472 that report a score; it scores higher than 82% of them and lower than 16%. Its site EUI of 52.0 kBtu/ft² is about 28% below the average of 72.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.4 kgCO₂e/ft² is about 24% below the group average of 5.8 kgCO₂e/ft².

At 292,445 sq ft, it is about 42% above the average floor area of 206,097 sq ft for those buildings. It was built in 1983, 12 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 100 W. Chestnut St.'s energy performance changed over time?

BuildingCensus holds 9 Chicago disclosures for 100 W. Chestnut St., covering report years 2015–2023. Its ENERGY STAR score went from 83 in 2015 to 91 in 2023 (+8 points); its best year on file was 2017, at 99. Site EUI moved from 60.9 kBtu/ft² (2015) to 52.0 kBtu/ft² (2023), a 15% decrease. Reported emissions went from 1,872 tCO₂e to 1,279 tCO₂e over the same span (down 32%).

What does an ENERGY STAR score of 91 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 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 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. 100 W. Chestnut St.'s 52.0 kBtu/ft² across 292,445 sq ft works out to about 15.2 billion Btu (4,457 MWh-equivalent) in 2023. Its source EUI of 87.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,591,090 kWh of electricity, 97,731 therms of natural gas and 11,133 thousand gallons of water for the year.

Which law requires 100 W. Chestnut St. to report its energy use?

100 W. Chestnut St. 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:160343:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.