Real Estate Law USA.com

I am a CA Real Estate Agent dealing in residential sales. I have a client who is going to rent out her 2nd home and she would like me to put in the lease contract "Landlord can force tenant to move when the tenant misses the payment two times." I have minimal rental experience, but to me this seems like it is against the law (going around tenant/landlord laws). Is it enforceable if written into the contract, or is it against the law to include this in the agreement? Thanks, any help would be appreciated!