| Business | Phone |
| Senne Kelsey & Assoc Inc 12 Worthington Access Dr, Maryland Heights 63043 | (314) 744-4033 |
| Kuhlmann Design Group Inc 66 Progress Pkwy, Maryland Heights 63043 | (314) 434-8898 |
| International Design Svc Inc 11872 Adie Rd, Maryland Heights 63043 | (314) 872-1791 |
| G & W Engineering Corp 38 Worthington Access Dr, Maryland Heights 63043 | (314) 469-3737 |