The area of a corner lot shall be twenty percent (20%) greater than the minimum area required for an interior lot.
When the principal building is located with its greatest depth on the long side of a corner lot, the required rear yard may be reduced to a minimum of twenty percent (20%) of the average lot depth; but in no case shall the shortest distance, measured horizontally between any part of a building, and the rear lot line, be less than twenty (20) feet.