At a glance
Aon Center is a 3,193,966-square-foot office building at 200 E. Randolph Street in Chicago, Illinois, built in 1972. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 67.4 kBtu/ft² and 18,914 tCO₂e of greenhouse-gas emissions. That score is higher than 64% of the 320 scored office buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 79 (band B) |
| Site EUI | 67.4 kBtu/ft² |
| Source EUI | 115.5 kBtu/ft² |
| GHG emissions | 18,914 tCO₂e |
| GHG intensity | 5.9 kgCO₂e/ft² |
| Electricity | 25,336,775 kWh |
| Natural gas | 686,826 therms |
| Water use | 18,371 kgal |
| Gross floor area | 3,193,966 sq ft |
| Source record | chicago:101713:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 79 | +2 | 67.4 kBtu/ft² | 18,914 tCO₂e |
| 2022 | 77 | ±0 | 73.1 kBtu/ft² | 19,331 tCO₂e |
| 2021 | 77 | -4 | 69.8 kBtu/ft² | 19,200 tCO₂e |
| 2020 | 81 | +5 | 68.6 kBtu/ft² | 20,741 tCO₂e |
| 2019 | 76 | +6 | 92.6 kBtu/ft² | — |
| 2018 | 70 | -15 | 93.8 kBtu/ft² | 29,059 tCO₂e |
| 2017 | 85 | -7 | 89.9 kBtu/ft² | 31,058 tCO₂e |
| 2016 | 92 | +10 | 85.6 kBtu/ft² | 26,073 tCO₂e |
| 2015 | 82 | -2 | 95.4 kBtu/ft² | 34,518 tCO₂e |
| 2014 | 84 | 98.0 kBtu/ft² | 33,948 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
- 200 E. Randolph Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60601
- Coordinates
- 41.89506, -87.65379
Within ~1 km
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See also: most efficient in Chicago · biggest emitters
How does Aon Center compare with other office buildings in Chicago?
The latest disclosures cover 387 office buildings in Chicago, out of 3,852 buildings citywide. Aon Center's ENERGY STAR score of 79 compares with an average of 69 across the 320 that report a score; it scores higher than 64% of them and lower than 32%. Its site EUI of 67.4 kBtu/ft² is roughly in line with the average of 70.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 5.9 kgCO₂e/ft² is about 21% below the group average of 7.5 kgCO₂e/ft².
At 3,193,966 sq ft, it is about 554% above the average floor area of 488,124 sq ft for those buildings. It was built in 1972, 16 years later than the group's average year built (1957). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Aon Center's energy performance changed over time?
BuildingCensus holds 10 Chicago disclosures for Aon Center, covering report years 2014–2023. Its ENERGY STAR score went from 84 in 2014 to 79 in 2023 (-5 points); its best year on file was 2016, at 92. Site EUI moved from 98.0 kBtu/ft² (2014) to 67.4 kBtu/ft² (2023), a 31% decrease. Reported emissions went from 33,948 tCO₂e to 18,914 tCO₂e over the same span (down 44%).
What does an ENERGY STAR score of 79 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 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 falls in band B — above median (70–84). 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. Aon Center's 67.4 kBtu/ft² across 3,193,966 sq ft works out to about 215.3 billion Btu (63,090 MWh-equivalent) in 2023. Its source EUI of 115.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 25,336,775 kWh of electricity, 686,826 therms of natural gas and 18,371 thousand gallons of water for the year.
Which law requires Aon Center to report its energy use?
Aon Center 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:101713:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
More office buildings in Chicago
- 10/30 South Wacker· 3,014,304 sq ft · score 72 (B)
- The Franklin (227 West Monroe; 222 West Adams)· 2,967,721 sq ft · score 88 (A)
- OneTwoPru· 2,751,035 sq ft · score 80 (B)
- Old Post Office· 2,493,160 sq ft · score 88 (A)
- 135 S LaSalle Property LLC· 2,453,127 sq ft · EUI 51.1 kBtu/ft²
- 600 West Chicago & 900 N Kingsbury· 2,376,470 sq ft · score 39 (D)
- Office buildings in Chicago· 387 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 Aon Center's energy grade?
Aon Center scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Aon Center use?
Its 2023 site energy-use intensity was 67.4 kBtu/ft² (115.5 kBtu/ft² source) across 3,193,966 sq ft, including 25,336,775 kWh of electricity and 686,826 therms of natural gas.
What are Aon Center's carbon emissions?
Aon Center reported 18,914 tCO₂e of greenhouse-gas emissions (5.9 kgCO₂e/ft²) for 2023.
Where is Aon Center?
Aon Center is at 200 E. Randolph Street, in Chicago, Illinois 60601. Its coordinates are 41.89506, -87.65379 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Aon Center and when was it built?
Aon Center has 3,193,966 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1972 as its year built. It is classed as office.
Is Aon Center 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, “Aon Center, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/aon-center-e13af3aa (data as of October 2, 2026).