Side: where the side line is along an alley or public right-of-way, 10 feet or equal to the setbacks of the immediately adjacent buildings or as provided in § 164-145, whichever is less, but in no instance shall adequate site distances be encroached upon. Where neither side line is located along an alley or public right-of-way, at least one side yard setback must be equal to zero feet. No setback is required for the second side yard; however, if a side yard is provided, the setback must be no less than three feet and no greater than 10 feet.