All accessory buildings shall be subject to the following setback provisions:

Front Yard. Accessory buildings shall have a front yard not less than the main building.

Side Yard. There shall be a side yard not less than five (5) feet from any side lot line, or easement line, except that adjacent to a side street, the side yard shall never be less than fifteen (15) feet.

Rear Yard. There shall be a rear yard not less than three (3) feet from any lot line, alley line or easement line, except that if no alley exists, the rear yard shall not be less than ten (10) feet as measured from rear lot line.