The "owner occupied" clause generally is a prohibition on rentals. So, if you live there part time, it is still "owner-occuped".
I am not a CA attorney, laws vary from state to state, therefore you should always consult a local attorney.
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I agree with Mr. Millar. The lease refers to who occupies the unit, not how much time the occupant is there. A residence that you only stayed in one night a year would still be owner-occupied so long as you did not rent it to anyone else.