Whenever the tract to be subdivided is of such unusual size or shape or is surrounded by such development or unusual conditions that the strict application of the requirements contained in these regulations would result in real difficulties, substantial hardship or injustice, the City Council, after report by the Planning Commission, may vary or modify such requirements so that the subdivider may develop his property in a reasonable manner, but so that at the same time, the public welfare and interests of the City and surrounding areas are protected and the general intent and spirit of these regulations preserved. (KC 14-21)