In CA, how many units make it Commercial Multi-Fam?

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in nyc markets, any property with 2 residential units is considered '2 family' and any with 3 or more res units is treated as a multifamily plus requires a commercial type sprinkler system, and any property with 4 or more family as totally COMMERCIAL.

not sure yet of how it goes here in CA..

- is there a sprinkler system requirement over a certain # res/com units in cali?

- is a mixed-used property that consists of 1 store on the ground floor and 1 res  unit on the top floor considered commercial? is it considered multifamily? or would it need to have at least 2 res units to be 'multifamily', or 3?

oh and ins a property with 4 res units bt o com unit, still considerable as commercial in CA?