| Business | Phone |
| Levin Properties 2970 Maria Ave 229, Northbrook 60062 | (847) 480-9722 |
| North Suburban Development 650 Dundee Rd, Northbrook 60062 | (847) 498-2390 |
| Perennial Investments & Advsrs 125 Revere Dr, Northbrook 60062 | (847) 272-6006 |
| Praedium Development 707 Skokie Blvd 210, Northbrook 60062 | (847) 509-3600 |
| Property Research Data 3300 Commercial Ave C, Northbrook 60062 | (847) 509-8020 |
| Revolution Investment Corp 2241 Greenview Rd, Northbrook 60062 | (847) 242-0105 |
| Steven Nan Group Inc 601 Skokie Blvd, Northbrook 60062 | (847) 564-4640 |
| Washington Properties 400 Skokie Blvd, Northbrook 60062 | (847) 714-1790 |