In the residential district R-4 land and structures may be used only for the following:
(a) PRINCIPAL PERMITTED USES
Any use permitted in R-3.
(b) ACCESSORY USES
Any accessory use allowed in R-3.
(c) SPECIAL PERMIT USES
The following are allowed by special permit, subject to the conditions and requirements of Article 1371:
Any special permit use allowed in R-3.