At a glance
321 N. Clark Property, LLC is a 981,053-square-foot office building at 321 North Clark in Chicago, Illinois, built in 1987. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 87 out of 100 (grade A), a site energy-use intensity of 38.9 kBtu/ft² and 5,337 tCO₂e of greenhouse-gas emissions. That score is higher than 83% of the 320 scored office buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 87 (band A) |
| Site EUI | 38.9 kBtu/ft² |
| Source EUI | 108.9 kBtu/ft² |
| GHG emissions | 5,337 tCO₂e |
| GHG intensity | 5.4 kgCO₂e/ft² |
| Electricity | 11,179,453 kWh |
| Water use | 12,533 kgal |
| Gross floor area | 981,053 sq ft |
| Source record | chicago:101934:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 87 | +10 | 38.9 kBtu/ft² | 5,337 tCO₂e |
| 2022 | 77 | +1 | 44.9 kBtu/ft² | 5,807 tCO₂e |
| 2021 | 76 | -3 | 44.3 kBtu/ft² | 6,207 tCO₂e |
| 2020 | 79 | 43.9 kBtu/ft² | 6,718 tCO₂e | |
| 2019 | — | — | — | |
| 2018 | 66 | -17 | 54.8 kBtu/ft² | 9,343 tCO₂e |
| 2017 | 83 | ±0 | 56.4 kBtu/ft² | 10,689 tCO₂e |
| 2016 | 83 | +1 | 57.5 kBtu/ft² | 10,859 tCO₂e |
| 2015 | 82 | +3 | 55.8 kBtu/ft² | 11,482 tCO₂e |
| 2014 | 79 | 57.0 kBtu/ft² | 11,819 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 321 North Clark
- City
- Chicago
- State
- Illinois
- ZIP
- 60654
- Coordinates
- 41.88583, -87.63981
Within ~1 km
Nearby benchmarked buildings
- theMART, Chicagoscore —
Office · 4,131,093 sq ft
- 10/30 South Wackerscore 72
Office · 3,014,304 sq ft
- RICHARD J. DALEY CENTERscore 68
Courthouse · 1,541,766 sq ft
- Harris Bank Buildingscore —
Building · 1,526,102 sq ft
- 540 West Madisonscore 73
Financial Office · 1,222,281 sq ft
- 222 North LaSallescore 83
Office · 1,217,630 sq ft
See also: most efficient in Chicago · biggest emitters
How does 321 N. Clark Property, LLC compare with other office buildings in Chicago?
The latest disclosures cover 387 office buildings in Chicago, out of 3,852 buildings citywide. 321 N. Clark Property, LLC's ENERGY STAR score of 87 compares with an average of 69 across the 320 that report a score; it scores higher than 83% of them and lower than 14%. Its site EUI of 38.9 kBtu/ft² is about 45% 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 5.4 kgCO₂e/ft² is about 28% below the group average of 7.5 kgCO₂e/ft².
At 981,053 sq ft, it is about twice the average floor area of 488,124 sq ft for those buildings. It was built in 1987, 31 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 321 N. Clark Property, LLC's energy performance changed over time?
BuildingCensus holds 10 Chicago disclosures for 321 N. Clark Property, LLC, covering report years 2014–2023. Its ENERGY STAR score went from 79 in 2014 to 87 in 2023 (+8 points). Site EUI moved from 57.0 kBtu/ft² (2014) to 38.9 kBtu/ft² (2023), a 32% decrease. Reported emissions went from 11,819 tCO₂e to 5,337 tCO₂e over the same span (down 55%).
What does an ENERGY STAR score of 87 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 87 means the building performs better than about 87% of its national peers. BuildingCensus bands the score into report-card grades; 87 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. 321 N. Clark Property, LLC's 38.9 kBtu/ft² across 981,053 sq ft works out to about 38.2 billion Btu (11,184 MWh-equivalent) in 2023. Its source EUI of 108.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 11,179,453 kWh of electricity and 12,533 thousand gallons of water for the year.
Which law requires 321 N. Clark Property, LLC to report its energy use?
321 N. Clark Property, LLC 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:101934:2023). 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
- 151 North Franklin· 947,870 sq ft · score 93 (A)
- One South Dearborn· 942,732 sq ft · score 81 (B)
- NBC Tower· 939,350 sq ft · score 58 (C)
- 55 West Monroe· 895,765 sq ft · score 77 (B)
- 190 South LaSalle· 883,718 sq ft · score 76 (B)
- 100 North Riverside Plaza· 874,519 sq ft · EUI 21.2 kBtu/ft²
- 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 321 N. Clark Property, LLC's energy grade?
321 N. Clark Property, LLC scores 87 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 321 N. Clark Property, LLC use?
Its 2023 site energy-use intensity was 38.9 kBtu/ft² (108.9 kBtu/ft² source) across 981,053 sq ft, including 11,179,453 kWh of electricity.
What are 321 N. Clark Property, LLC's carbon emissions?
321 N. Clark Property, LLC reported 5,337 tCO₂e of greenhouse-gas emissions (5.4 kgCO₂e/ft²) for 2023.
Where is 321 N. Clark Property, LLC?
321 N. Clark Property, LLC is at 321 North Clark, in Chicago, Illinois 60654. Its coordinates are 41.88583, -87.63981 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is 321 N. Clark Property, LLC and when was it built?
321 N. Clark Property, LLC has 981,053 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1987 as its year built. It is classed as office.
Is 321 N. Clark Property, LLC 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.
Working with Chicago building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “321 N. Clark Property, LLC, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/321-n-clark-property-llc-d5fd5e3e (data as of October 2, 2026).