No yard or any other open space required about or in connection with any building or buildings on a lot shall be used for any other building.

No existing yard or existing lot shall be reduced in dimension or area below the minimum requirements set forth herein. Yards or lots created hereafter shall meet at least the minimum requirements established by this chapter.

Except as hereinafter specified, required yard areas shall be entirely free of buildings, parking and storage areas.

Cornices, eaves, steps, bulkheads, bay/box/bow windows, and chimneys only may project not more than three feet over any required yard area. Cantilevered or garrison designed buildings shall not project into any required yard area.

Sills, leaders, belt courses and similar ornamental or structural features may project only six inches into any required yard.

The requirements for yard areas shall not apply to any retaining wall, steps or any other fence or wall which is less than three feet high. Multiple retaining walls constructed in a required yard area shall be separated one from the other by a level area of a width equal to the highest adjoining retaining wall.

On a corner lot, no building or structure shall be located nearer to a street line than the required front yard depth.