From and after the effective date of such ordinance establishing any setback line or lines, it shall be unlawful for any person, firm or corporation to construct any building, wall, fence, or other structure within the space between the street line and the setback line so established, and the Building Inspector shall refuse to issue any permit for any building or structure to be erected within such space. The establishment of such setback line or lines shall not operate in derogation of any greater setback requirement established by any subdivision or zoning law applicable to the property affected thereby.
(`83 Code, § 12.12.060)