The following regulations are established to regulate the design and development of buildings in an R-3 district.
(a) Setback from Existing Rights-of-Way. The setback of a principal building from an existing public right-of-way shall not be less than 40 feet or, when the lot is adjacent to an R-1 or R-2 District, equal to the required setback of an adjacent R District whichever is greater.
(b) Setback from Project Boundary. The setback of a principal building from any project boundary that is not an existing public right-of-way shall not be less than the following:
(1) 40 feet or a distance equal to the length of the wall, whichever is greater, when abutting single-family residential districts.
(2) 20 feet or a distance equal to one-half the length of the wall, whichever is greater, when abutting all other districts including R-3 Districts.
(c) Building Spacing. The minimum distance between buildings on the same site, shall not be less than the distances set forth below:
(1) When the main wall of one building faces the main wall of another building, the minimum separation between the two walls shall be 40 feet or equal to the length of the overlap, whichever is greater.
(2) When the main wall of one building faces an end wall of another building, the minimum separation between the two walls shall be 30 feet or equal to one-half of the length of the overlap, whichever is greater.
(3) When the end wall of one building faces an end wall of another building, the minimum separation between the two walls shall be 20 feet.
(d) Definitions. The following definitions shall apply to terms used in this Section:
(1) Main Wall. The outside wall(s) of a building, which contains the primary windows of any living, family or dining room.
(2) End Wall. The outside walls other than a main wall of a building, which may be blank or contain windows not considered to be primary windows.
(e) Building Arrangement. Multi-family buildings may be arranged in a group and the buildings need not front directly onto a street.