All existing bars, taverns, restaurants, cafes and other places for the serving of food or beverages, or both food and beverages, whether such food and/or beverages are served inside a structure or outside a structure, or both inside and outside a structure, that are structurally altered and/or renovated where the occupancy would be increased by greater than 20%, as determined by the Department of Planning and Development, shall be permitted only by special exception permit from the Planning Board, after the required public hearing, except when located in a planned shopping center over 350,000 square feet.