The R2 - General Residence District is composed of certain medium-density residential areas of the city, representing a compatible mixture of single-unit and multiple-unit dwellings, plus certain open areas where similar residential development appears likely to occur. 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, except as noted below for large developments, to prohibit all activities of a commercial nature except those having also some aspects of residential use, such as home offices of doctors or ministers, funeral homes, membership clubs, rooming houses and tourist homes, controlled by specific limitations governing the size and extent of such semicommercial activities. To these ends, development is limited to a medium concentration, and permitted uses are typically single- and two-unit dwellings, row dwellings and low-rise apartments, providing homes for the residents in a variety of dwelling types, plus certain additional uses such as schools, parks, churches, hospitals and 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; and service commercial facilities for very large residential developments may be permitted in special instances, with controls assigned to protect residential amenities.