| Business | Phone |
| Consolidated Electrical Distr 1615 Bonanza St # 210, Walnut Creek 94596 | (925) 934-8340 |
| Summit Technology 2717 N Main St # 15, Walnut Creek 94597 | (925) 944-1212 |
| Advanced Design & Development Walnut Creek 94596 | (510) 919-4900 |
| Summit Ii 1755 Locust St, Walnut Creek 94596 | (925) 934-0771 |