Office of a professional person, provided there shall be no more than one professional office in a building, that the balance of the building is not leased or rented by the owner to be utilized as a residence, and that there is no display of advertising other than a professional nameplate. If more than one office is desired (for more than one professional person), application for a conditional use permit must be made pursuant to § 370-84. In no event shall offices be permitted for more than two professional persons. Such professions shall be limited to physicians, dentists, chiropractors, chiropodists, optometrists, attorneys, ministers, accountants, psychologists, architects, engineers, musical instructors, marriage counselors and speech pathologists.