It has been determined that structures with apartments, apartment buildings, rooming houses and multiple dwelling units (MDU's) are not in conformity with the character of the R-4 Residential District. Such structures and uses mar the appearances of the residential neighborhood, impair the use, enjoyment and desirability and reduce the values of properties, are detrimental to the character of the neighborhood, prevent the most appropriate development and utilization of land and therefore adversely affect the functioning, economic stability, prosperity, health, safety and general welfare of the entire community. Structures with apartments, apartment buildings, rooming houses and multiple dwelling units (MDU's) are expressly prohibited in the Residence R-4 District, unless expressly permitted and authorized pursuant to § 164-10.