The location and distribution of the various permitted dwelling unit types shall be approved by the commission. Particular attention will be given to those units to be located on the perimeter of the site, taking into consideration the relationship and compatibility of such dwelling to the character and future development of surrounding properties. The commission may require that only single-family detached dwellings be located in those areas of the site where other types of permitted dwelling units are determined to be not in conformity with the character of the adjacent area. (Ord. 1000 § 52.51(E), 1955)