Properties in the R-1A and R-1B Zones may be developed only for townhouses and apartments subject to the following requirements and limitations:
A.
In the R-1A District, at least 2/3 of the total number of housing units shall be townhouses. The remaining 1/3, which shall include required units intended for occupancy by low- and moderate-income households, may be either townhouses or apartments.
B.
In the R-1B District, all housing units shall be townhouses, except that housing units intended for occupancy by low- and moderate-income households, may be either townhouses or apartments.