It shall be unlawful for any person to erect or construct any building or structure upon any land area included within any adopted future width lines or official plan lines, with the exception of the following:
(A) Street improvements, drainage structures, city or public utility lines or structures or similar structures or installations which have first been approved by the Planning Commission.
(B) Temporary fences, farm irrigation and drainage structures and temporary buildings or structures having a value as determined by the Director of Public Works of not more than $500 may be permitted upon the securing of a conditional use permit from the Planning Commission in each particular case.
(`61 Code, § 19.19) (Ord. 371, passed 1-19-1960)