If a renter is late on rent, you can begin eviction procedures even though you may not be able to contact them directly by phone or in person. For example, you can serve your renter with a notice to pay rent immediately by posting a copy of the notice on the residence, followed by mailing a copy of the notice to the renter’s address. However, to serve a notice by posting and mailing, you must tape or tack the notice to the rental unit in an obvious place, like the front door. Service of the notice is complete when you mail the notice and the notice period stated in the letter begins the day after you mail the letter. For additional information about eviction procedures in California, visit http://www.freelegalaid.com/nav/california/landlord-tenant-law/article/what-do-about-eviction-notice-california. The California Department of Consumer Affairs also has information about how to properly serve an eviction notice at http://www.dca.ca.gov/publications/landlordbook/terminations.shtml#properserviceofnotices.