Where the owner of a lot of official record at the time of adoption of this ordinance does not own sufficient adjacent land to enable him to conform to the yard and other requirements of this ordinance, one building and its accessory structures may be built provided the yard space and other requirements conform as closely as possible, in the opinion of the board of zoning adjustment, to the requirements of the district in which it is located and further provided that neither side yard shall be reduced to less than five feet in width.

No building need be set back more than the average of the setbacks of the existing residences within 100 feet each side thereof.

Height limitations shall not apply to church steeples, hospitals, sanitariums, barns, silos, farm structures, chimneys, flag poles, public utility poles, radio and television towers, antennae, and aerials, cooling towers, water tanks, and industrial structures when required by manufacturing process.