No sign shall be constructed or displayed unless a building permit shall have first been obtained from the Building Inspector provided, any sign as permitted or regulated in § 600-185A, B, C and D will not require a building permit. When occupant vacates from a business location, all nonconforming signs pertaining to that business are to be removed and the new tenant to comply with the requirements of this article. If such sign is not removed within 30 days after such vacation or termination of use, the Building Inspector shall, upon 10 days' notice, in writing, to the landlord, cause such sign to be removed and the cost of such removal shall be a lien on such premises.