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 fewer than four lodgers residing with a family in either
one of such dwelling units.
B. Multiple dwellings.
(1) Buildings containing one or two dwelling units with four or more
lodgers with a family in either one of such dwelling units.
(2) Buildings containing three or more dwelling units.
(3) Apartment houses and apartment hotels.
(5) Buildings with sleeping accommodations for more than five persons
used or occupied as a club, dormitory, fraternity or sorority house
or for similar uses.
C. Accessory structures. Garages, carports and similar type structures
on residential premises.
D. Mixed occupancy. Occupancy of a building in part for residential
use and in part for some other use not accessory thereto.