11. A tenement is any building or structure or any portion thereof, erected before April eighteenth, nineteen hundred twenty-nine, which is occupied, wholly or in part, as the residence of three families or more living independently of each other and doing their cooking upon the premises and includes apartment houses, flat houses and all other houses so erected and occupied, except that a tenement shall not be deemed to include any converted dwelling. An old law tenement is a tenement existing before April twelfth, nineteen hundred one, and recorded as such in the tenement house department before April eighteenth, nineteen hundred twenty-nine, except that it shall not be deemed to include any converted dwelling.
12. A hotel is an inn having thirty or more sleeping rooms.
13. Dwelling unit shall mean any residential accommodation in a multiple dwelling or private dwelling.
14. Apartment shall mean one or more living rooms, arranged to be occupied as a unit separate from all other rooms within a dwelling, with lawful sanitary facilities and a lawful kitchen or kitchenette for the exclusive use of the family residing in such unit.
15. 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.