Retail and services: At least 50% of a building’s frontage on a public plaza must be occupied by retail or service establishments allowed under the applicable underlying zoning district. These uses may include neighborhood retail uses such as restaurants, supermarkets and clothing stores. Certain uses that are incompatible with the goal of providing active, enlivening establishments adjacent to the public plaza are prohibited, including offices, wholesale establishments, automobile servicing and showrooms, public parking garages and lots, certain manufacturing establishments, banks, and plumbing, heating, and ventilating equipment showrooms. To ensure that valuable retail spaces are provided, each such establishment is required to be at least 15 feet in depth.