The provisions of this chapter do not apply to the parking of mobilehomes in a mobilehome park nor does this chapter apply to mobilehomes placed on residentially zoned lots when such installation has been approved by the planning commission and city council; nor does it apply to trailers for commercial coaches in nonresidential zones when such installation has been specifically approved by the planning commission and city council; nor do the provisions of this chapter apply to temporary buildings, trailers, or commercial coaches used in conjunction with public works projects as defined in section 8.20.080 of this chapter. (Prior code § 66001)