At a glance
123 N Wacker is a 555,996-square-foot office building in Chicago, Illinois, built in 1986. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 73 out of 100 (grade B), a site energy-use intensity of 43.5 kBtu/ft² and 3,388 tCO₂e of greenhouse-gas emissions. That score is higher than 46% of the 320 scored office buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 73 (band B) |
| Site EUI | 43.5 kBtu/ft² |
| Source EUI | 121.9 kBtu/ft² |
| GHG emissions | 3,388 tCO₂e |
| GHG intensity | 6.1 kgCO₂e/ft² |
| Electricity | 7,095,852 kWh |
| Water use | 3 kgal |
| Gross floor area | 555,996 sq ft |
| Source record | chicago:101871:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 73 | +7 | 43.5 kBtu/ft² | 3,388 tCO₂e |
| 2022 | 66 | -1 | 49.4 kBtu/ft² | 3,615 tCO₂e |
| 2021 | 67 | -10 | 48.2 kBtu/ft² | 3,826 tCO₂e |
| 2020 | 77 | +6 | 40.4 kBtu/ft² | 3,708 tCO₂e |
| 2019 | 71 | +17 | 45.2 kBtu/ft² | — |
| 2018 | 54 | -31 | 50.7 kBtu/ft² | 4,963 tCO₂e |
| 2017 | 85 | +2 | 46.7 kBtu/ft² | 5,079 tCO₂e |
| 2016 | 83 | -1 | 56.1 kBtu/ft² | 6,083 tCO₂e |
| 2015 | 84 | +7 | 54.5 kBtu/ft² | 6,437 tCO₂e |
| 2014 | 77 | 63.0 kBtu/ft² | 7,482 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
- 123 N Wacker
- City
- Chicago
- State
- Illinois
- ZIP
- 60606
- Coordinates
- 41.88779, -87.62128
Within ~1 km
Nearby benchmarked buildings
Hospital (General Medical & Surgical) · 2,200,000 sq ft
- 71215A State Stscore 45
Retail Store · 1,841,736 sq ft
- 680 North Lake Shore Drivescore 87
Multifamily Housing · 1,647,872 sq ft
- 311 S. Wackerscore 81
Office · 1,433,821 sq ft
- The Field Museumscore —
Mixed Use Property · 1,280,537 sq ft
- RiverView Condominium Associationscore 100
Multifamily Housing · 1,135,720 sq ft
See also: most efficient in Chicago · biggest emitters
How does 123 N Wacker compare with other office buildings in Chicago?
The latest disclosures cover 387 office buildings in Chicago, out of 3,852 buildings citywide. 123 N Wacker's ENERGY STAR score of 73 compares with an average of 69 across the 320 that report a score; it scores higher than 46% of them and lower than 50%. Its site EUI of 43.5 kBtu/ft² is about 38% below 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 6.1 kgCO₂e/ft² is about 19% below the group average of 7.5 kgCO₂e/ft².
At 555,996 sq ft, it is about 14% above the average floor area of 488,124 sq ft for those buildings. It was built in 1986, 30 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 123 N Wacker's energy performance changed over time?
BuildingCensus holds 10 Chicago disclosures for 123 N Wacker, covering report years 2014–2023. Its ENERGY STAR score went from 77 in 2014 to 73 in 2023 (-4 points); its best year on file was 2017, at 85. Site EUI moved from 63.0 kBtu/ft² (2014) to 43.5 kBtu/ft² (2023), a 31% decrease. Reported emissions went from 7,482 tCO₂e to 3,388 tCO₂e over the same span (down 55%).
What does an ENERGY STAR score of 73 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 73 means the building performs better than about 73% of its national peers. BuildingCensus bands the score into report-card grades; 73 falls in band B — above median (70–84). It sits 2 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. 123 N Wacker's 43.5 kBtu/ft² across 555,996 sq ft works out to about 24.2 billion Btu (7,088 MWh-equivalent) in 2023. Its source EUI of 121.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 7,095,852 kWh of electricity and 3 thousand gallons of water for the year.
Which law requires 123 N Wacker to report its energy use?
123 N Wacker 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:101871:2023). 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
- One North LaSalle· 554,777 sq ft · score 73 (B)
- 200 West Jackson Boulevard Building· 534,330 sq ft · score 71 (B)
- 332 Property LLC· 529,401 sq ft · score 73 (B)
- 225 West Washington· 528,730 sq ft · score 76 (B)
- Congress Center· 527,238 sq ft · score 80 (B)
- 550 West Adams· 519,368 sq ft · score 87 (A)
- 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 123 N Wacker's energy grade?
123 N Wacker scores 73 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 123 N Wacker use?
Its 2023 site energy-use intensity was 43.5 kBtu/ft² (121.9 kBtu/ft² source) across 555,996 sq ft, including 7,095,852 kWh of electricity.
What are 123 N Wacker's carbon emissions?
123 N Wacker reported 3,388 tCO₂e of greenhouse-gas emissions (6.1 kgCO₂e/ft²) for 2023.
Where is 123 N Wacker?
123 N Wacker is in Chicago, Illinois 60606. Its coordinates are 41.88779, -87.62128 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is 123 N Wacker and when was it built?
123 N Wacker has 555,996 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1986 as its year built. It is classed as office.
Is 123 N Wacker 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, “123 N Wacker, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/123-n-wacker-2a1b1d1f (data as of October 2, 2026).