Building site area required in the R-3 districts shall be six thousand square feet, except where combined with any B district, but not less than two thousand five hundred square feet of land area for each living unit in any multiple dwelling or dwelling group and not less than one thousand square feet of land area for each guest room in any rooming house, boardinghouse or similar establishment. (Ord. 2020-07 § 2, 2020; Zoning Ordinance dated 7/94, 1994)