Selling my house but have tenant until December, does ';Owner Occupancy law'; in Los Angeles and kick out tent?

Selling my home but have tenants until December, is there rent control ';Owner Occupancy Law'; in Los Angeles that if I sell the house and if the new owner wants to live in the house, the tentant has to move even if the contract is not expired or after expired contract? Any websites would be helpful? I would like to rent rooms downstairs, do I need a permit or write a contract, is it legal to rent rooms out in Los Angeles, can I rent month-to-month in my rent control area? www.csupomona.edu/~ccsan Thanks.