401 East Ontario Condominiums
Multifamily Housing in Chicago, IL · 401 East Ontario · 60611
At a glance
401 East Ontario Condominiums is a 450,000-square-foot multifamily housing building in Chicago, Illinois, built in 1988. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 92 out of 100 (grade A), a site energy-use intensity of 57.7 kBtu/ft² and 1,832 tCO₂e of greenhouse-gas emissions. That score is higher than 84% 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 | 92 (band A) |
| Site EUI | 57.7 kBtu/ft² |
| Source EUI | 80.9 kBtu/ft² |
| GHG emissions | 1,832 tCO₂e |
| GHG intensity | 4.1 kgCO₂e/ft² |
| Electricity | 1,529,789 kWh |
| Natural gas | 207,483 therms |
| Water use | 11,843 kgal |
| Gross floor area | 450,000 sq ft |
| Source record | chicago:236816:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 92 | 57.7 kBtu/ft² | 1,832 tCO₂e | |
| 2022 | — | — | — | |
| 2021 | — | — | — | |
| 2020 | — | — | — | |
| 2019 | 90 | +3 | 63.3 kBtu/ft² | 2,199 tCO₂e |
| 2018 | 87 | ±0 | 69.1 kBtu/ft² | 2,354 tCO₂e |
| 2017 | 87 | -1 | 65.2 kBtu/ft² | 2,323 tCO₂e |
| 2016 | 88 | ±0 | 65.6 kBtu/ft² | 2,386 tCO₂e |
| 2015 | 88 | 64.2 kBtu/ft² | 2,439 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
- 401 East Ontario
- City
- Chicago
- State
- Illinois
- ZIP
- 60611
- Coordinates
- 41.82937, -87.66778
Within ~1 km
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- CDOT Central Officescore 60
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- Irvingscore 19
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See also: most efficient in Chicago · biggest emitters
How does 401 East Ontario Condominiums 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. 401 East Ontario Condominiums's ENERGY STAR score of 92 compares with an average of 62 across the 1,472 that report a score; it scores higher than 84% of them and lower than 15%. Its site EUI of 57.7 kBtu/ft² is about 20% 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 4.1 kgCO₂e/ft² is about 29% below the group average of 5.8 kgCO₂e/ft².
At 450,000 sq ft, it is about twice the average floor area of 206,097 sq ft for those buildings. It was built in 1988, 17 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 401 East Ontario Condominiums's energy performance changed over time?
BuildingCensus holds 9 Chicago disclosures for 401 East Ontario Condominiums, covering report years 2015–2023. Its ENERGY STAR score went from 88 in 2015 to 92 in 2023 (+4 points). Site EUI moved from 64.2 kBtu/ft² (2015) to 57.7 kBtu/ft² (2023), a 10% decrease. Reported emissions went from 2,439 tCO₂e to 1,832 tCO₂e over the same span (down 25%).
What does an ENERGY STAR score of 92 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 92 means the building performs better than about 92% of its national peers. BuildingCensus bands the score into report-card grades; 92 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. 401 East Ontario Condominiums's 57.7 kBtu/ft² across 450,000 sq ft works out to about 26 billion Btu (7,610 MWh-equivalent) in 2023. Its source EUI of 80.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,529,789 kWh of electricity, 207,483 therms of natural gas and 11,843 thousand gallons of water for the year.
Which law requires 401 East Ontario Condominiums to report its energy use?
401 East Ontario Condominiums 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:236816:2023). 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
- State and Chestnut· 449,500 sq ft · score 55 (C)
- The Sexton Condominium Association· 449,107 sq ft · score 100 (A)
- 535 North Michigan· 448,591 sq ft · score 96 (A)
- Transportation Building Condominium Association· 447,776 sq ft · score 100 (A)
- 1000 S Clark (ks50)· 445,666 sq ft · score 49 (D)
- The Cooper (th110, co020)· 441,369 sq ft · score 79 (B)
- Multifamily Housing buildings in Chicago· 1,515 benchmarked
- All Chicago benchmarked buildings· Building Energy Use Benchmarking Ordinance
- Most efficient large buildings in Chicago
- Least efficient large buildings in Chicago
- Biggest emitters in Chicago
Frequently asked questions
What is 401 East Ontario Condominiums's energy grade?
401 East Ontario Condominiums scores 92 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 401 East Ontario Condominiums use?
Its 2023 site energy-use intensity was 57.7 kBtu/ft² (80.9 kBtu/ft² source) across 450,000 sq ft, including 1,529,789 kWh of electricity and 207,483 therms of natural gas.
What are 401 East Ontario Condominiums's carbon emissions?
401 East Ontario Condominiums reported 1,832 tCO₂e of greenhouse-gas emissions (4.1 kgCO₂e/ft²) for 2023.
Where is 401 East Ontario Condominiums?
401 East Ontario Condominiums is in Chicago, Illinois 60611. Its coordinates are 41.82937, -87.66778 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is 401 East Ontario Condominiums and when was it built?
401 East Ontario Condominiums has 450,000 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1988 as its year built. It is classed as multifamily housing.
Is 401 East Ontario Condominiums 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, “401 East Ontario Condominiums, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/401-east-ontario-condominiums-94c31539 (data as of October 2, 2026).