Wherever it is determined that a street is necessary for the future subdivision of the property as shown on the subdivision map or for adjoining property, but that the present dedication and construction of such street is not warranted, the subdivider shall conditionally offer such street for dedication. The widths and locations of such streets shall be determined by the City Engineer. (Ord. 3153 § 2 (Exh. C), 2010; Ord. 2100 § 1, 1985; Ord. 1369, 1971; prior code § 28.1102(5)).