| Business | Phone |
| Advanced Environmental Systems 3280 E Foothill Blvd, Pasadena 91107 | (626) 432-6630 |
| Symvionics Inc 3280 E Foothill Blvd # 200, Pasadena 91107 | (626) 305-1400 |
| Kpff Consulting Engineers 2 N Lake Ave # 850, Pasadena 91101 | (626) 578-1121 |
| Mwh Americas Inc 250 N Madison Ave, Pasadena 91101 | (626) 568-6310 |
| Mwh Americas Inc 300 N Lake Ave, Pasadena 91101 | (626) 568-6600 |
| Rc Construction Co 260 S Los Robles Ave # 306, Pasadena 91101 | (626) 675-9555 |
| Welch Engineering 225 S Lake Ave, Pasadena 91101 | (626) 432-7219 |
| Turboflo Engineers 20 N Raymond Ave, Pasadena 91103 | (626) 584-1100 |
| Rem Engineering Co Inc 1575 N Lake Ave # 100, Pasadena 91104 | (626) 296-7200 |