Accessory uses. Accessory uses and structures permitted in the R-5AC district are those uses and structures which are customarily incidental and subordinate to a principal permitted use. Horses, provided they are kept under sanitary conditions and provided that unattended horses are at all times kept within a fence which shall not be permitted closer than 50 feet to a property line. No horse or pony may be kept on a lot less than 45,000 square feet. A minimum sixty-thousand-square-foot area is required for two horses, and a minimum eighty-thousand-square-foot area is required for three horses. If more than three horses or ponies are kept, an additional 15,000 square feet per additional horse or pony shall be required.
In case of a question concerning whether a use or structure is accessory to a permitted principal use, the determination thereof shall lie with the Zoning Board of Adjustment.