| Business | Phone |
| Cal-First Realty 4748 Laura Dr, Concord 94521 | (925) 674-9100 |
| Cambridge Arms Condos 1100 Victory Ln # 6, Concord 94520 | (925) 676-9447 |
| Terraza Del Sol 2061 Olivera Rd, Concord 94520 | (925) 798-6845 |
| Torrey Pines Homeowners Assn Concord 94520 | (925) 671-0347 |