Whenever the tract proposed to be subdivided is of such unusual topography, size, or shape, or is surrounded by such development or unique conditions that the strict application of the requirements contained in these regulations would result in hardships or injustices, the Council, upon recommendation of the Commission, may vary or modify such requirements to allow the proprietor to develop in a reasonable manner with due regard for the public health, welfare, and safety so that the interests of the City and surrounding area are protected and the general intent and spirit of this chapter are preserved.