| Business | Phone |
| Midwest Structural Drafting Co 28 E Jackson Blvd 1500, Chicago 60604 | (312) 427-3990 |
| O H & R Special Steels Co 933 E 95th St, Chicago 60619 | (773) 768-7057 |
| I M Steel Inc 18 N Ada St, Chicago 60607 | (312) 432-9400 |
| J & D Erectors Inc 1021 W Adams St, Chicago 60607 | (312) 850-9330 |
| Windy City Iron Works 1334 N Kostner Ave, Chicago 60651 | (773) 252-4820 |
| J & D Erectors Inc 7616 W Berwyn Ave, Chicago 60656 | (773) 763-6912 |