Delineation of the various residential groups, indicating for each such grouping its general extent, size and composition in terms of total number of dwelling units, approximate percentage allocation by dwelling-unit type (i.e., single-family detached, duplex, townhouse, garden apartments, high-rise) and 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 each such area.