Chatham Park South Co-Op
Multifamily Housing in Chicago, IL · 660 E 85th Street · 60619
At a glance
Chatham Park South Co-Op is a 75,264-square-foot multifamily housing building at 660 E 85th Street in Chicago, Illinois, built in 1983. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 54 out of 100 (grade D), a site energy-use intensity of 63.2 kBtu/ft² and 507 tCO₂e of greenhouse-gas emissions. That score is higher than 36% 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 | 54 (band D) |
| Site EUI | 63.2 kBtu/ft² |
| Source EUI | 134.6 kBtu/ft² |
| GHG emissions | 507 tCO₂e |
| GHG intensity | 6.7 kgCO₂e/ft² |
| Electricity | 860,401 kWh |
| Natural gas | 18,180 therms |
| Gross floor area | 75,264 sq ft |
| Source record | chicago:173961:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 54 | ±0 | 63.2 kBtu/ft² | 507 tCO₂e |
| 2022 | 54 | -2 | 67.4 kBtu/ft² | 523 tCO₂e |
| 2021 | 56 | +3 | 65.5 kBtu/ft² | 534 tCO₂e |
| 2020 | 53 | +11 | 66.5 kBtu/ft² | 583 tCO₂e |
| 2019 | 42 | +3 | 72.7 kBtu/ft² | 678 tCO₂e |
| 2018 | 39 | -1 | 76.0 kBtu/ft² | 705 tCO₂e |
| 2017 | 40 | -4 | 67.6 kBtu/ft² | 700 tCO₂e |
| 2016 | 44 | 69.2 kBtu/ft² | 698 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
- 660 E 85th Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60619
- Coordinates
- 41.87388, -87.67978
Within ~1 km
Nearby benchmarked buildings
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- 3430-40 N Lake Shorescore 61
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- 1922 W Ogden Avescore 100
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See also: most efficient in Chicago · biggest emitters
How does Chatham Park South Co-Op 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. Chatham Park South Co-Op's ENERGY STAR score of 54 compares with an average of 62 across the 1,472 that report a score; it scores higher than 36% of them and lower than 64%. Its site EUI of 63.2 kBtu/ft² is about 12% 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 6.7 kgCO₂e/ft² is about 16% above the group average of 5.8 kgCO₂e/ft².
At 75,264 sq ft, it is about 63% below the average floor area of 206,097 sq ft for those buildings. It was built in 1983, 12 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 Chatham Park South Co-Op's energy performance changed over time?
BuildingCensus holds 8 Chicago disclosures for Chatham Park South Co-Op, covering report years 2016–2023. Its ENERGY STAR score went from 44 in 2016 to 54 in 2023 (+10 points); its best year on file was 2021, at 56. Site EUI moved from 69.2 kBtu/ft² (2016) to 63.2 kBtu/ft² (2023), a 9% decrease. Reported emissions went from 698 tCO₂e to 507 tCO₂e over the same span (down 27%).
What does an ENERGY STAR score of 54 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 54 means the building performs better than about 54% of its national peers. BuildingCensus bands the score into report-card grades; 54 falls in band D — lowest band (1–54). It sits 21 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. Chatham Park South Co-Op's 63.2 kBtu/ft² across 75,264 sq ft works out to about 4.8 billion Btu (1,394 MWh-equivalent) in 2023. Its source EUI of 134.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 860,401 kWh of electricity and 18,180 therms of natural gas for the year.
Which law requires Chatham Park South Co-Op to report its energy use?
Chatham Park South Co-Op 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:173961:2023). 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
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Frequently asked questions
What is Chatham Park South Co-Op's energy grade?
Chatham Park South Co-Op scores 54 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Chatham Park South Co-Op use?
Its 2023 site energy-use intensity was 63.2 kBtu/ft² (134.6 kBtu/ft² source) across 75,264 sq ft, including 860,401 kWh of electricity and 18,180 therms of natural gas.
What are Chatham Park South Co-Op's carbon emissions?
Chatham Park South Co-Op reported 507 tCO₂e of greenhouse-gas emissions (6.7 kgCO₂e/ft²) for 2023.
Where is Chatham Park South Co-Op?
Chatham Park South Co-Op is at 660 E 85th Street, in Chicago, Illinois 60619. Its coordinates are 41.87388, -87.67978 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Chatham Park South Co-Op and when was it built?
Chatham Park South Co-Op has 75,264 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1983 as its year built. It is classed as multifamily housing.
Is Chatham Park South Co-Op 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, “Chatham Park South Co-Op, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/chatham-park-south-co-op-590fd72c (data as of October 2, 2026).