County Assessors Office Share: Government County Assessors Office Visit Website 1055 Monterey Street, Suite D360 San Luis Obispo, California 93408 (805) 781-5643 About Map About Discovers, inventories, and values all real and personal property in the County Creates and maintains assessment maps for all real property Tracks and updates property ownership for all property. What's Nearby? Distance: 5 10 15 20 25 50 mi.