No structure, addition to a structure, grading, stairway, pool, tennis court, spa or solid fence shall be constructed on or down the face of any bluff on private land or within fifty feet of such bluff’s edge (as the terms “bluff” and “bluff edge” are defined in PVEMC §§ 19.01.030 and 19.01.040, respectively) without meeting the requirements of PVEMC § 19.02.020(D), precise plan approval.