San Mateo County Small Business Development Center Share: Business/Development Consultants San Mateo County Small Business Development Center Visit Website 1700 W. Hillsdale Blvd., Bldg. 10, Rm. #491 San Mateo, CA 94402 (650) 574-6402 Map What's Nearby? Distance: 5 10 15 20 25 50 mi.