| Business | Phone |
| Hq Global Workplaces 1415 W 22nd St Tower, Oak Brook 60523 | (630) 954-2200 |
| Land Of Nod 35 Oak Brook Center Mall, Oak Brook 60523 | (630) 928-0460 |
| Regus Business Ctr Inc 700 Commerce Dr 5, Oak Brook 60523 | (630) 288-4600 |
| Uidc Management Inc 100 Oakbrook Ctr, Oak Brook 60523 | (630) 571-3417 |