Car sharing vehicles and commercial vehicle parking for motor vehicles not exceeding a length of 20 feet shall be permitted, as follows:

(a)        Accessory off-street parking facilities

Car sharing vehicles may occupy parking spaces in an accessory off-street parking facility, provided that such car sharing vehicles shall not exceed 20 percent of all parking spaces in such facility, or five spaces, whichever is greater. Accessory residential off-street parking spaces shall be made available to the occupant of a residence to which it is accessory within 30 days after a written request therefor is made to the landlord.

(b)        Public parking garages and public parking lots

(1)        Car sharing vehicles shall be permitted within public parking garages and, where authorized pursuant to Section 16-342, public parking lots, provided such vehicles do not exceed, in total, 40 percent of the total number of parking spaces permitted.

(2)        Commercial vehicle parking for motor vehicles not exceeding a length of 20 feet shall be permitted within public parking garages and, where authorized pursuant to Section 16-342, public parking lots, provided that the total amount of parking spaces occupied by commercial vehicles shall not exceed 10 percent of the total number of parking spaces permitted, or 10 spaces, whichever is less.