You must check with the Community Development Department to be sure the location is zoned for a restaurant.
Community Development Department
1800 Francisco Blvd
Pacifica, CA 94044
650-738-7341
If there is already, or has been in the recent past, a restaurant in that location this should not be an issue. You would need to contact the San Mateo County Environmental Health Division, 650-372-6200, for clearance before opening. You would also need to obtain a Business License from the City, and the Fire Department would have to make an inspection.
If you are doing business under a fictitious name you will need to file a fictitious name statement with the County Recorder's Office of the County of San Mateo, 650-363-4500.
You will also need to obtain a Seller's Permit from the State Board of Equalization, 800-400-7115.