| Business | Phone |
| Aerotek Commercial Staffing 2311 W 22nd St 101, Oak Brook 60523 | (630) 645-3500 |
| Gage Consulting Engineers 1100 Jorie Blvd 140, Oak Brook 60523 | (630) 472-0918 |
| Bollinger Lach & Assoc 1010 Jorie Blvd 22, Oak Brook 60523 | (630) 990-1385 |
| Foundry Networks 2215 York Rd 301, Oak Brook 60523 | (630) 571-1220 |
| Column Engineering 2215 York Rd, Oak Brook 60523 | (630) 990-9200 |