Side yard: For every detached dwelling, there shall be two side yards with an aggregate width of 20 feet minimum, neither of which shall be less than eight feet in width. For every semidetached dwelling, there shall be one side yard which shall not be less than 10 feet in width. For the end unit in a row or cluster of attached dwellings, there shall be one side yard which shall be not less than 10 feet in width. For every multifamily or apartment structure, there shall be two side yards with an aggregate width of 30 feet minimum, neither of which shall be less than 10 feet in width.