It shall be the duty of the Zoning Officer, upon the filing with him of any application for a zoning permit or certificate of conformance, to require the owner or agent of such structure or land to certify in writing the use or intended use of any structure or land to be constructed, altered or required, and he shall thereupon determine if such structure or use is permitted by the provisions of this chapter. In case he shall determine that such structure or use, or both, is nonconforming, he shall notify such owner or agent in writing to that effect, stating in what respect such structure or use is a nonconforming structure or use.