Okay, so every one of these properties are in direct violation of Fed, State & local Occupancy Laws.
"The Uniform Housing Code requires that residential units have at least one room with an area of at least 120 square feet and that other rooms to be lived in be at least 70 square feet. If more than two people sleep in a bedroom, it must be at least 50 square feet larger for every additional occupant sleeping in that room."
Maximum occupancy is 3 persons per bedroom, but bedrooms MUST meet square footage requirements.
Sauce
https://legalbeagle.com/12167016-occupancy-limit-regulations-california.html
Pic 1 from another anon
Pic 2 from sauce