| Business | Phone |
| Illinois Industrial Properties 1211 W 22nd St, Oak Brook 60523 | (630) 368-3340 |
| Intrepid Properties 2311 W 22nd St, Oak Brook 60523 | (630) 575-8338 |
| Saballus Co Inc 2021 Midwest Rd, Oak Brook 60523 | (630) 953-8500 |
| Terrestris Development 1301 W 22nd St 210, Oak Brook 60523 | (630) 573-0460 |
| Wispark Corp 1415 W 22nd St, Oak Brook 60523 | (630) 684-2377 |