No building, structure, or other improvement, shall hereafter be erected, constructed, enlarged, or placed within the official plan lines established by this chapter, or amendments thereto, except that this section shall not apply to garden and agricultural crop planting or fences and agricultural irrigation systems in connection therewith, street, curb, gutter and sidewalk improvements, public utility poles, pipelines or a temporary building or structure having a value of not more than one thousand dollars. Provided, however, that prior to the construction of any temporary building or structure the owner of the property on which it is to be located shall execute an agreement with the city of Palo Alto in accordance with the provisions of Section 20.04.140.
(Ord. 2214 (part), 1964: prior code § 36.403)