| Business | Phone |
| Bilman & Bilman Consulting 835 Mission St, South Pasadena 91030 | (626) 403-6726 |
| Concord Consulting Group 722 Fremont Ave, South Pasadena 91030 | (619) 516-3377 |
| Kam Engineering 1107 Fair Oaks Ave, South Pasadena 91030 | (626) 799-8730 |
| Science Engineering Management 1020 Arroyo Dr, South Pasadena 91030 | (626) 799-7901 |