40 E. Oak
Multifamily Housing in Chicago, IL · 40 E Oak Street · 60611
At a glance
40 E. Oak is a 154,113-square-foot multifamily housing building at 40 E Oak Street in Chicago, Illinois, built in 1928. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 59 out of 100 (grade C), a site energy-use intensity of 97.5 kBtu/ft² and 1,014 tCO₂e of greenhouse-gas emissions. That score is higher than 41% of the 1,472 scored multifamily housing buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 59 (band C) |
| Site EUI | 97.5 kBtu/ft² |
| Source EUI | 130.7 kBtu/ft² |
| GHG emissions | 1,014 tCO₂e |
| GHG intensity | 6.6 kgCO₂e/ft² |
| Electricity | 729,121 kWh |
| Natural gas | 125,426 therms |
| Water use | 4,906 kgal |
| Gross floor area | 154,113 sq ft |
| Source record | chicago:251281:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 59 | +13 | 97.5 kBtu/ft² | 1,014 tCO₂e |
| 2022 | 46 | -5 | 117.3 kBtu/ft² | 1,181 tCO₂e |
| 2021 | 51 | +10 | 107.1 kBtu/ft² | 1,134 tCO₂e |
| 2020 | 41 | -3 | 116.7 kBtu/ft² | 1,243 tCO₂e |
| 2019 | 44 | -1 | 119.0 kBtu/ft² | 1,274 tCO₂e |
| 2018 | 45 | -2 | 119.9 kBtu/ft² | 1,289 tCO₂e |
| 2017 | 47 | +13 | 110.1 kBtu/ft² | 1,286 tCO₂e |
| 2016 | 34 | 116.0 kBtu/ft² | 1,367 tCO₂e |
Compliance context
Building Energy Use Benchmarking Ordinance
Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 40 E Oak Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60611
- Coordinates
- 41.70757, -87.60523
Within ~1 km
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See also: most efficient in Chicago · biggest emitters
How does 40 E. Oak 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. 40 E. Oak's ENERGY STAR score of 59 compares with an average of 62 across the 1,472 that report a score; it scores higher than 41% of them and lower than 58%. Its site EUI of 97.5 kBtu/ft² is about 35% 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 6.6 kgCO₂e/ft² is about 14% above the group average of 5.8 kgCO₂e/ft².
At 154,113 sq ft, it is about 25% below the average floor area of 206,097 sq ft for those buildings. It was built in 1928, 43 years earlier 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 40 E. Oak's energy performance changed over time?
BuildingCensus holds 8 Chicago disclosures for 40 E. Oak, covering report years 2016–2023. Its ENERGY STAR score went from 34 in 2016 to 59 in 2023 (+25 points). Site EUI moved from 116.0 kBtu/ft² (2016) to 97.5 kBtu/ft² (2023), a 16% decrease. Reported emissions went from 1,367 tCO₂e to 1,014 tCO₂e over the same span (down 26%).
What does an ENERGY STAR score of 59 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 59 means the building performs better than about 59% of its national peers. BuildingCensus bands the score into report-card grades; 59 falls in band C — below median (55–69). It sits 16 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. 40 E. Oak's 97.5 kBtu/ft² across 154,113 sq ft works out to about 15 billion Btu (4,404 MWh-equivalent) in 2023. Its source EUI of 130.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 729,121 kWh of electricity, 125,426 therms of natural gas and 4,906 thousand gallons of water for the year.
Which law requires 40 E. Oak to report its energy use?
40 E. Oak 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:251281:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
More multifamily housing buildings in Chicago
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- 731 S Plymouth· 151,865 sq ft · score 33 (D)
- (IL584) - 1240 Lake Shore Drive (1240 N. Lake Shore Drive)· 151,528 sq ft · score 10 (D)
- 2555 North Clark· 151,339 sq ft · score 21 (D)
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Frequently asked questions
What is 40 E. Oak's energy grade?
40 E. Oak scores 59 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 40 E. Oak use?
Its 2023 site energy-use intensity was 97.5 kBtu/ft² (130.7 kBtu/ft² source) across 154,113 sq ft, including 729,121 kWh of electricity and 125,426 therms of natural gas.
What are 40 E. Oak's carbon emissions?
40 E. Oak reported 1,014 tCO₂e of greenhouse-gas emissions (6.6 kgCO₂e/ft²) for 2023.
Where is 40 E. Oak?
40 E. Oak is at 40 E Oak Street, in Chicago, Illinois 60611. Its coordinates are 41.70757, -87.60523 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is 40 E. Oak and when was it built?
40 E. Oak has 154,113 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1928 as its year built. It is classed as multifamily housing.
Is 40 E. Oak covered by the Building Energy Use Benchmarking Ordinance?
Yes — it appears in the 2023 Chicago Energy Benchmarking disclosure, which lists the buildings reporting under the Building Energy Use Benchmarking Ordinance.
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About this data
Source: Chicago Energy Benchmarking (Building Energy Use Benchmarking Ordinance), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “40 E. Oak, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/40-e-oak-c18bdba8 (data as of October 2, 2026).