The R-4 Multiple-Family Residential District is composed of certain medium-density residential areas of Richland Township representing a compatible mingling of single-unit and multiple-unit dwellings. The regulations for this district are designed to stabilize and protect the essential characteristics of the district; to promote and encourage a suitable environment for family life; and to prohibit all activities of a commercial nature except certain home occupations, controlled by specific limitations governing the size and extent of such nonresidential activities. To these ends, development is limited to a medium concentration and permitted uses are typically single- and two-unit dwellings, townhouses, plus certain public facilities which serve the residents of the district. However, high-rise apartments, with corresponding proportions of open space, also may be developed under prescribed standards of density and open space.