| Business | Phone |
| Bay Counties Development Co San Mateo 94403 | (650) 345-7722 |
| Castle Group 2500 S El Camino Real, San Mateo 94403 | (650) 378-3140 |
| Dewey Land Co 999 Baker Way # 300, San Mateo 94404 | (650) 571-1010 |
| Equity Office 2929 Campus Dr, San Mateo 94403 | (650) 341-5302 |
| Equity Office 901 Mariners Island Blvd, San Mateo 94404 | (650) 345-3615 |
| Global Intervals Inc 1000 S Amphlett Blvd, San Mateo 94402 | (650) 571-9276 |
| Hillside Development Co San Mateo 94403 | (650) 345-7722 |
| Interland 411 Borel Ave # 600, San Mateo 94402 | (650) 574-9200 |
| Landmark Equities Po Box 6811, San Mateo 94403 | (650) 341-6500 |
| O'Brien Group 2001 Windward Way # 200, San Mateo 94404 | (650) 377-0300 |
| San Mateo Real Estate Inc 1777 Borel Pl, San Mateo 94402 | (650) 578-0330 |
| Sares Regis Group-Northern Ca 901 Mariners Island Blvd # 700, San Mateo 94404 | (650) 378-2800 |
| Tkg Intl 2755 Campus Dr, San Mateo 94403 | (650) 372-1222 |
| Highland Development Co 400 S El Camino Real # 650, San Mateo 94402 | (650) 340-9910 |