To effectuate the purposes of the R-3-C zone and to encourage new development at one time of large areas of land for multiple-dwelling use and the redevelopment at one time of many existing buildings in such zone for multiple-dwelling use, the following are the standards for minimum lot area per dwelling unit and the maximum number of dwelling units:
(A) A lot or contiguous lots of 22,499 square feet or less in gross area on the date an application for a building permit has been filed with the city for construction of a dwelling or dwellings on the lot or lots shall conform to the following standards: the ratio of dwelling units to the area of a lot or contiguous lots shall be not more than one dwelling unit for each 1,875 square feet of gross lot area; and the maximum number of dwelling units shall be 23.2 per acre of land, exclusive of any portion thereof dedicated for streets and master planned flood control and drainage easements;
(B) A lot or contiguous lots of 22,500 square feet or more in gross area on the date an application for a building permit has been filed with the city for construction of a dwelling or dwellings on the lot or lots shall conform to the following standards: the ratio of dwelling units to the area of a lot or contiguous lots shall be not more than one dwelling unit for each 1,500 square feet of gross lot area; and the maximum number of dwelling units shall be 29 per acre of land, exclusive of any portion thereof dedicated for streets and master planned flood control and drainage easements;
(C) Additional allowable dwelling units for land previously burdened by public street easements and abutting a lot or contiguous lots of 22,500 square feet or more in gross area shall conform to the following standards: if at the time an application for a building permit has been filed with the city for construction of a dwelling or dwellings on a lot or contiguous lots 22,500 square feet or more in gross area and an easement or right-of-way for street purposes, which abutted all or any portion of the lot or lots, has been vacated as of the date, the ratio of dwelling units for the portion of the lot or lots constituting the previous street easement, as vacated, shall be one dwelling unit for each 750 square feet of said vacated easement portion of the lot or lots, and the maximum number of dwelling units for the vacated easement portion of such lot or lots shall not exceed 58 dwelling units per acre, exclusive of any portion thereof dedicated for streets and master planned flood control and drainage easements.
(`78 Code, § 17.26.080.)