At a glance
Old Post Office is a 2,493,160-square-foot office building at 433 West Harrison Street in Chicago, Illinois, built in 2018. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 88 out of 100 (grade A), a site energy-use intensity of 70.7 kBtu/ft² and 15,036 tCO₂e of greenhouse-gas emissions. That score is higher than 86% of the 320 scored office buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 88 (band A) |
| Site EUI | 70.7 kBtu/ft² |
| Source EUI | 116.9 kBtu/ft² |
| GHG emissions | 15,036 tCO₂e |
| GHG intensity | 6.0 kgCO₂e/ft² |
| Electricity | 19,246,610 kWh |
| Natural gas | 506,787 therms |
| Water use | 6,131 kgal |
| Gross floor area | 2,493,160 sq ft |
| Source record | chicago:103689:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 88 | +19 | 70.7 kBtu/ft² | 15,036 tCO₂e |
| 2022 | 69 | -13 | 74.2 kBtu/ft² | 14,703 tCO₂e |
| 2021 | 82 | 62.0 kBtu/ft² | 12,038 tCO₂e | |
| 2020 | — | — | — | |
| 2019 | — | — | — | |
| 2018 | — | — | — |
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
- 433 West Harrison Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60607
- Coordinates
- 41.90586, -87.62889
Within ~1 km
Nearby benchmarked buildings
- 350 North Orleans (Rivion LLC)score 61
Office · 1,883,966 sq ft
- Michigan Plazascore 43
Office · 1,867,610 sq ft
- 70 W Madisonscore 73
Office · 1,601,760 sq ft
- Stroger Hospital Campusscore 12
Hospital (General Medical & Surgical) · 1,596,300 sq ft
- 100/150 S. Wackerscore 78
Office · 1,281,114 sq ft
- The 400 Condominium Associationscore 69
Multifamily Housing · 1,110,000 sq ft
See also: most efficient in Chicago · biggest emitters
How does Old Post Office compare with other office buildings in Chicago?
The latest disclosures cover 387 office buildings in Chicago, out of 3,852 buildings citywide. Old Post Office's ENERGY STAR score of 88 compares with an average of 69 across the 320 that report a score; it scores higher than 86% of them and lower than 12%. Its site EUI of 70.7 kBtu/ft² is roughly in line with the average of 70.4 kBtu/ft². Its emissions intensity of 6.0 kgCO₂e/ft² is about 20% below the group average of 7.5 kgCO₂e/ft².
At 2,493,160 sq ft, it is about 411% above the average floor area of 488,124 sq ft for those buildings. It was built in 2018, 62 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 Old Post Office's energy performance changed over time?
BuildingCensus holds 6 Chicago disclosures for Old Post Office, covering report years 2018–2023. Its ENERGY STAR score went from 82 in 2021 to 88 in 2023 (+6 points). Site EUI moved from 62.0 kBtu/ft² (2021) to 70.7 kBtu/ft² (2023), an 14% increase. Reported emissions went from 12,038 tCO₂e to 15,036 tCO₂e over the same span (up 25%).
What does an ENERGY STAR score of 88 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 88 means the building performs better than about 88% of its national peers. BuildingCensus bands the score into report-card grades; 88 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. Old Post Office's 70.7 kBtu/ft² across 2,493,160 sq ft works out to about 176.3 billion Btu (51,659 MWh-equivalent) in 2023. Its source EUI of 116.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 19,246,610 kWh of electricity, 506,787 therms of natural gas and 6,131 thousand gallons of water for the year.
Which law requires Old Post Office to report its energy use?
Old Post Office 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:103689:2023). 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
- 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)
- CH3 - Chicago 300 E Randolph· 2,224,842 sq ft · score 75 (B)
- 350 North Orleans (Rivion LLC)· 1,883,966 sq ft · score 61 (C)
- AMA Plaza· 1,870,680 sq ft · score 58 (C)
- Michigan Plaza· 1,867,610 sq ft · score 43 (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 Old Post Office's energy grade?
Old Post Office scores 88 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 Old Post Office use?
Its 2023 site energy-use intensity was 70.7 kBtu/ft² (116.9 kBtu/ft² source) across 2,493,160 sq ft, including 19,246,610 kWh of electricity and 506,787 therms of natural gas.
What are Old Post Office's carbon emissions?
Old Post Office reported 15,036 tCO₂e of greenhouse-gas emissions (6.0 kgCO₂e/ft²) for 2023.
Where is Old Post Office?
Old Post Office is at 433 West Harrison Street, in Chicago, Illinois 60607. Its coordinates are 41.90586, -87.62889 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Old Post Office and when was it built?
Old Post Office has 2,493,160 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2018 as its year built. It is classed as office.
Is Old Post Office 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, “Old Post Office, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/old-post-office-efdeac66 (data as of October 2, 2026).