||Intent. This district is primarily for office buildings. The office district classification will be applied as a transitional use buffer between residential uses and uses which would be incompatible in direct contact with residential districts. Permitted principal uses. (a) Executive and administrative offices for establishments whose plants, warehouses or outlets are not permitted in the "O" district. (b) Any office in which goods, wares or merchandise are not commercially created, displayed, stored, exchanged or sold, such as the following: Business offices of a public utility, real estate, insurance, commercial or industrial establishment. Offices of physicians, dentists and other health practitioners; legal, engineering, architectural and surveying services; accounting, auditing and bookkeeping services. Finance, insurance and real estate offices; travel bureau; and banks. Government offices. Business services such as: advertising, consumer credit reporting agencies, mailing list and stenographic services, business and management consulting services. Office of nonprofit organizations, such as professional membership organizations, labor unions, civic, social and fraternal associations, political organizations and religious organizations. Veterinary hospitals and kennels providing medical, surgical, boarding, grooming and bathing facilities for small nonfarm animals such as dogs, cats and birds as a special exception use pursuant to section 5:104. All facilities must be completely enclosed in a sound proof building in such a way as to produce no objectionable odors at the lot lines. Any permitted principal use of the "R" dwelling district, subject to all the regulations of the district in which such use first occurs. Indoor court game facilities, including, but not limited to, handball, racquetball, paddleball, squash, ping-pong and similar uses, when located in an enclosed building shall be permitted as a special exception use pursuant to section 5:104. Artists' studios, provided no more than 25 percent of the total floor area of the studio is used for the display and sale of articles which are produced in the studio. Funeral homes. Private colleges, universities and other institutions of higher learning, offering courses in general, technical or religious education. Permitted accessory uses. Those allowed in the R3 district. Incidental services may be provided within office buildings for the convenience of occupants of that building, such as news, cigar or candy stands, delicatessens, restaurants, personal service shops and similar uses, provided the following conditions are fulfilled: Not more than 5 percent of the building's usable floor area is used for incidental services. All such incidental services shall be situated within the interior of the building so that no part thereof shall be directly accessible from the outside of the building.