| Business | Phone |
| Spectrum Office Ctr 175 Olde Half Day Rd 100, Lincolnshire 60069 | (847) 634-5500 |
| Equity Office Properties 200 Tri State Intl, Lincolnshire 60069 | (847) 940-8604 |
| Equity Office Properties Trust 75 Tri State Intl, Lincolnshire 60069 | (847) 945-3207 |
| Millbrook Properties Llc 485 Half Day Rd 220, Lincolnshire 60069 | (847) 883-9700 |