The following principal uses are permitted in a C-O district when located within a building:

    A.    Office or office building for the conduct of business, administrator or professional services, where these activities do not include the manufacture, storage, display except samples, or sale at retail of any merchandise on the premises; including but not limited to the following types of office occupancy: accountant, advertising, architect, attorney, broker (stock and bond), business consultant, business management, chiropodist, chiropractor, collecting agency, dentist, employment agency, engineer, finance, industrial management, insurance, landscape architect, loan agency, mortgage, optometrist, osteopath, philanthropic or charitable organi-

zation, physician, public utilities, real estate, sales representative, secretarial, social services, telephone answering, travel agent;

    B.    Bank;

    C.    Blue printing or other copying service;

    D.    Clubhouse, or rooms used by members or an organized club, lodge, union or society;

    E.    Medical laboratory, dental laboratory. (Prior gen. code § 8-46.1)