I live in CA and am considering putting a friend on the lease. However, as of recent I have had several bad experiences with having roommates, friends or not. I'm wondering, if I have him put on the lease, can I have a secondary contract with him, stating that if there is conflict, nonpayment of rent or utilities, lack of respect for personal items, etc, then he will be given 30 days to move out and have himself removed from the lease?