| Business | Phone |
| Foster Engineering Inc 29 La Vuelta # 1, Orinda 94563 | (925) 258-8912 |
| Safe Engineering Construction 23 Orinda Way # 309, Orinda 94563 | (925) 253-1000 |
| Edward Searby Pro Engineer 30 Saint Stephens Dr, Orinda 94563 | (925) 284-4000 |
| Tkc Assoc 23 Orinda Way, Orinda 94563 | (925) 254-8300 |