Shops and stores and service establishments,
limited to the following: apparel, bakery, barber, beauty, book, dry-cleaning,
confectionery, drug, florist, specialty food, gift, laundry, jewelry,
millinery, print and newspaper, tailor, ice cream and sandwich shops
and caterers, photographers and photo supplies, restaurants, theaters,
clinics, cocktail lounges, public and private substations and transportation
terminals, provided that not more than 20% in the aggregate of the
land area of any one M-4 District shall be used for such purposes.