| Business | Phone |
| 1335 Astor Cooperative Bldg 1335 N Astor St, Chicago 60610 | (312) 266-1465 |
| Abm Engineering 175 N Franklin St, Chicago 60606 | (312) 795-0140 |
| Ajax Engineering 6417 N Ravenswood Ave, Chicago 60626 | (773) 973-0191 |
| Barrett Bowman & Assoc 130 E Randolph St 2650, Chicago 60601 | (312) 228-0100 |
| Ghafari Kso 360 N Michigan Ave 1100, Chicago 60601 | (312) 984-2300 |
| Bio Medical Engineering 28 E Jackson Blvd, Chicago 60604 | (312) 663-0024 |
| Bsa Life Structures 440 N Wells St 410, Chicago 60610 | (312) 324-5600 |
| Burns Mc Donnell 300 W Adams St 832, Chicago 60606 | (312) 223-0920 |
| Resolution Enterprises Inc 333 W Wacker Dr, Chicago 60606 | (312) 444-2022 |
| Engineering Management 123 W Madison St, Chicago 60602 | (312) 327-0920 |
| Electronic Engineering Times 225 N Michigan Ave, Chicago 60601 | (312) 946-6600 |
| E Me Engineers Consultant 250 S Wacker Dr 1050, Chicago 60606 | (630) 396-0601 |
| Civilgroup Engineering 203 N Wabash Ave 604, Chicago 60601 | (312) 214-0500 |
| D & D Engineering 1020 S Wabash Ave, Chicago 60605 | (312) 922-7573 |
| D & D Engineering 641 W Lake St, Chicago 60661 | (312) 596-5326 |
| Corporate Resource Engineering 410 S Michigan Ave, Chicago 60605 | (312) 786-0228 |
| Cosmodog Limited 415 W Huron St, Chicago 60610 | (312) 440-0344 |
| Grand Ohio Venture Engr Office 211 E Ohio St, Chicago 60611 | (312) 645-1872 |