I've only researched this superficially but I believe that in Los Angeles county and possibly California at large it's the case that commercial zones include mu

I've only researched this superficially but I believe that in Los Angeles county and possibly California at large it's the case that commercial zones include multi-family residential uses, so a C4 is also effectively an R4. You can see that here. https://planning.lacity.org/odocument/eadcb225-a16b-4ce6-bc94-c915408c2b04/Zoning_Code_Summary.pdf https://planning.lacity.org/odocument/eadcb225-a16b-4ce6-bc9...