Yes indeed, along with many other requirements.
Please do not rent out an "illegal" unit in California. I would suggest instead hiring a real estate agent or landlord attorney to walk you through how to get the room up to code and get a certificate of occupancy so you can lawfully rent it.
It will be tough, but getting everything up to code will be a great investment and increase the value of the property going forward. If it is not worth it, then do not rent it! Damages can easily reach into the 20k range for an unlawful unit, especially in a rent controlled area.
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