ROOMING UNIT shall mean one or more living rooms arranged to be occupied as a unit separate from all other living rooms and which does not have both lawful sanitary facilities and lawful cooking facilities for the exclusive use of the family residing in such unit. It may be located either within an apartment or within any class A or class B multiple dwelling. A rooming unit shall not include a living room in a class B hotel or any other dwelling complying with section sixty-seven of the Multiple Dwelling Law and so classified and recorded in the department.