The development and execution of a zoning ordinance is based upon the division of the city into districts, within which districts the use of land and buildings and the bulk and location of buildings and structures in relation to the land are substantially uniform. It is recognized, however, that there are special uses which, because of their unique characteristics, cannot properly be classified in any particular district or districts without consideration in each case of the impact of those uses upon neighboring land, and of the public need for the particular use at the particular location. Special uses fall into two categories:
(A) Uses publicly operated or traditionally affected with a public interest.
(B) Uses entirely private in character but of such a nature that their operation may give rise to unique problems with respect to their impact upon neighboring property or public facilities.
('69 Code, App. A, § 10.8-1)