Where deemed essential by the Planning Commission, upon consideration of the particular type of development proposed in the subdivision and especially in large-scale neighborhood unit developments not anticipated in the Master Plan, or such portions thereof as have been promulgated, the Planning Commission, with concurrence by Council, may require the dedication or reservation of such other areas of a character, extent and location suitable to the needs created by such development for parks, playgrounds, schools or other public use areas. However, in no case shall the total amount of required public areas, in addition to public streets, exceed five percent of the total gross acreage controlled by one owner. Wherever practical, areas reserved for or dedicated as public sites and/or open spaces shall be contiguous to similar areas in adjacent tracts of land.