I researched California 'Landlord/Tenant Basics' which is quite an extensive explanation on California Landlord/Tenant Law! http://www.courts.ca.gov/partners/documents;lthandouts.pdf
If you scroll down a ways you will see "Defenses to Eviction" and it describes one of the defenses one would have if the LL accepted rent beyond expiration of the 30/60 day notice.
Based on the above, I'm quite sure the OP would prevail in court if the LL tried to evict him after accepting rent that covered a period of time AFTER the 60 day notice to vacate expired!