The following standards shall apply to all multiple dwellings in the R-3-C zone:
(A) A portion of each lot, building site or parcel of land shall contain a minimum area of 200 square feet of usable outdoor living space for each dwelling unit of a multiple-dwelling, exclusive of front yards;
(B) The outdoor living space shall be allocated in the following manner:
(1) Not less than 50% of the space shall be provided in a single common area, each dimension of which shall not be less than 15 feet:
(a) Portions of yards (excluding the front yard) which are contiguous with an integral part of such common living space may be included in calculating the area and minimum dimensions of such space;
(b) Swimming pools and recreation areas may be installed and improved in the required common living space;
(c) Not less than 30% of the common living space shall be permanently landscaped;
(2) Not less than 25% of the total required outdoor living space shall be provided outdoor living space contiguous to each dwelling unit in a multiple dwelling;
(3) Common and private outdoor living space areas shall be reasonably accessible to dwelling units served;
(4) In calculating the required area for common and private outdoor living spaces driveways shall not be included.
(`78 Code, § 17.26.200.)