§ 255-153.3.   MD Multi-Dwelling Districts.
In the MD Multi-Dwelling Districts, the following shall be permitted and no other:
   A.    permitted in residential districts; provided, however, that a larger may be permitted when granted by the Zoning Hearing Board as a .
   B.   One freestanding or parallel wall per frontage, provided that it does not exceed 32 square feet and, in the case of a , 10 feet in height.