| Business | Phone |
| Amalgamated Transit 1153 Chess Dr # 203, Foster City 94404 | (650) 573-7933 |
| Building & Construction Trades 1153 Chess Dr # 206, Foster City 94404 | (650) 358-9977 |
| Carpenter's 1153 Chess Dr # 100, Foster City 94404 | (650) 377-0217 |
| Communications Workers-America 1153 Chess Dr # 204, Foster City 94404 | (650) 286-9430 |
| Hardwood Floor Layers 1153 Chess Dr, Foster City 94404 | (650) 286-1861 |
| San Mateo County Central Labor 1153 Chess Dr # 200, Foster City 94404 | (650) 572-8848 |