Top 10 Largest Office Buildings
in Cook County
| Office building | Address | Sqft | Year built |
|---|---|---|---|
| Willis Tower | 233 South Wacker Drive, 60606 | 3,920,000 | 1973 |
| Willis Tower | 233 South Wacker Drive, 60606 | 3,800,000 | 1973 |
| Merchandise Mart | 222 West Merchandise Mart Plaza, 60654 | 3,651,737 | 1929 |
| The Merchandise Mart | 222 Merchandise Mart Plaza, 60654 | 3,563,120 | 1930 |
| The Post Office | 433 West Van Buren Street, 60607 | 2,800,000 | 2019 |
| Aon Center | 200 East Randolph Street, 60601 | 2,687,933 | 1972 |
| Chase Tower | 10 South Dearborn Street, 60603 | 2,429,909 | 1969 |
| 3333 Beverly Road | 3333 Beverly Road, 60192 | 2,421,114 | 1992 |
| CME Center | 30 South Wacker Drive, 60606 | 2,351,265 | 1983 |
| Old Main Post Office | 433 West Van Buren Street, 60607 | 2,293,766 | 2019 |
Largest Office Properties Recently Completed
in Cook County
| Office building | Address | Sqft | Year built |
|---|---|---|---|
| Willis Tower - Catalog Expansion | 233 South Wacker Drive, 60606 | 455,000 | 2021 |
| Fulton Labs | 400 North Aberdeen Street, 60642 | 423,454 | 2021 |
| 320 North Sangamon Street | 320 North Sangamon Street, 60607 | 270,000 | 2021 |
| 448 North LaSalle | 448 North LaSalle Street, 60654 | 174,599 | 2021 |
| Advocate Health Counseling and Pediatric Development Center | 901 West Wellington Avenue, 60657 | 51,969 | 2021 |
| 1100 West Fulton Street | 1100 West Fulton Street, 60607 | 44,635 | 2021 |
| 110 North Wacker | 110 North Wacker Drive, 60606 | 1,565,909 | 2020 |
| 167 Green Street | 167 Green Street, 60661 | 750,023 | 2020 |
| 24 East Washington | 24 East Washington Street, 60602 | 740,000 | 2020 |
| West End on Fulton | 1375 West Fulton Market, 60654 | 297,839 | 2020 |
News
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