Buildings, for the purpose of this chapter, shall be classified in respect to their occupancies as follows:
(a) One and Two-Family Dwellings. Buildings containing one or two dwelling units with not more than two lodgers residing with a family in either one of such dwelling units.
(b) Multiple Dwellings. Buildings containing one or two dwelling units with more than two lodgers with a family in either one of such dwelling units; buildings containing three or more dwelling units; apartment houses and apartment hotels; lodging houses; buildings with sleeping accommodations for more than five persons used or occupied as a club, dormitory, fraternity or sorority house, or for similar use; garden apartments.
(c) Accessory Structures. Garages, carports and similar type structures or residential premises.