Delineation of the various residential areas, indicating for each such area its general extent, size and composition in terms of the total number of dwelling units, approximate percentage allocation by dwelling-unit type (i.e., single-family detached, duplex, townhouse, garden apartments or high-rise) and a general description of the intended market structure (i.e., luxury, middle income, moderate income, elderly units, family units, etc.), plus a calculation of the residential density in dwelling units per gross acre (total area, including interior roadways) for such area and a calculation of total permeable area.