In the MFR, CMU, MU, RC, IMU, and I zones, emergency shelters, emergency housing, transitional housing sites, permanent supportive housing sites and transitional parking sites shall be limited to no more than 20 individuals being served. In the R-1, R-2, R-3, R-4, and NC zones, transitional housing and permanent supportive housing shall be limited to no more than 10 adults per dwelling unit, not including children under the age of 18.