Land and buildings in the Suburban Office and Institutional District (SO) shall be used only for the following purposes:
(a) Administrative and Business Offices. Administrative offices primarily engaged in general administration, supervision, purchasing, accounting and other management functions and business offices carrying on no retail trade with the general public and having no stock of goods maintained for sale to customers, including financial services, real estate and insurance.
(b) Professional Offices. Professional offices engaged in providing tangible and intangible services to the general public, involving both persons and their possessions, including: offices of physicians and surgeons, dentists and dental surgeons, osteopathic physicians, and chiropractors, medical and dental laboratories, health and allied services, legal services, design services including engineering, architecture, landscape architecture, urban planning, graphic arts and interior design, accounting, auditing and bookkeeping services, and professional services not elsewhere classified.
(c) Institution. Institutions providing social, cultural, educational and health services to member agencies, organizations and individuals or to the general public, including: hospitals, elementary and secondary schools, colleges and universities, vocational schools, professional schools, libraries, museums and art galleries, and religious organizations.
(d) Organizations and Associations. Organizations and associations organized on a profit-making or nonprofit-making basis, for the promotion of membership interests, including: business associations, professional membership organizations, labor unions and similar labor organizations, civic, social and fraternal associations, political organizations, charitable organizations, and nonprofit membership organizations not elsewhere classified.
(e) Residential dwelling ancillary and subordinate to a principal permitted use.