No lot shall have erected upon it more than one residential building except as otherwise specifically authorized in this Chapter.

An accessory building attached to the main building shall comply in all respects with the requirements of this Chapter applicable to the main building.

No accessory building or private parking area in a residence district shall be located in any front yard. For purposes of this provision a driveway shall not be considered a private parking area.

Accessory buildings in residence districts shall not exceed one and one-half (1 1/2) stories or twenty-one (21') feet in height. The space occupied shall not exceed 30% of the required side or rear yard.

In residence districts the minimum distance of any accessory building from an adjacent building or property line shall be five (5') feet.

Except as otherwise provided in this Chapter, no more than one principal use shall be permitted on any lot.