Every detached and semidetached building hereafter erected or used in whole or in part as a dwelling shall comply with the area requirements prescribed for the R-2 Residence Districts in § 80-15 hereof. For attached commercial buildings which are used in part for dwelling purposes and for commercial and other buildings, no part of which is used as a dwelling, the following area regulations shall apply:
A.
Lot area and lot width. Attached commercial buildings which are used in part for dwelling purposes shall have a lot area of not less than 3,000 square feet per family, and shall have a lot width of not less than 25 feet. There are no minimum lot area and width requirements for buildings no part of which are used for dwelling purposes.
B.
Building area. Not more than 60% of the area of each lot may be occupied by buildings.
C.
Front yard. There shall be a front yard on each street on which a lot abuts, which shall be not less than 20 feet in depth, subject to the provisions of § 80-37. The front yard on the long side of a corner lot may be reduced to a depth of not less than 10 feet.
D.
Side yards. Side yards are not required, subject to the following provisions:
(1)
Where side yards are provided, each such side yard shall be not less than five feet in width.
(2)
Where a lot used for business purposes abuts a residence district, a side yard of not less than five feet shall be provided on the side of the lot which abuts the residence district.
E.
Rear yard. There shall be a rear yard on each lot, which shall be not less than 20 feet in depth.