For the purposes of this § 14-604(9), an agricultural structure shall mean a structure used to grow food or non-food crops, including, but not limited to, high tunnels, cold frames, hoop houses, and green houses. L&I shall not require a zoning permit for an accessory agricultural structure erected for 180 or fewer days. All accessory agricultural structures are subject to compliance with the following:
(a) An accessory agricultural structure erected for 180 or fewer days (1) is permitted only in a side or rear yard, provided that the structure is set back at least 20 ft. from side and rear lot lines and (2) shall not exceed 18 ft. in height.
(b) An accessory agricultural structure erected for more than 180 days must comply with the requirements of this Zoning Code.