All applications for zoning permit shall be made on forms provided by the Mayor and Board of Aldermen and shall be accompanied by plans in duplicate, drawn to scale, showing the location, shape and dimensions of the lot to be built upon, the size and location of existing buildings thereon, the lines within which the proposed building is to be erected or altered and the existing and intended use of each building or part thereof, the height thereof and the number of families intended to be accommodated. The applicant shall also give such other pertinent information respecting the proposed use of such property as may be necessary to determine the propriety of the issuance of a zoning permit. If the Zoning Enforcement Official issues a zoning permit, he shall return to the applicant, properly certified, one copy of the plans submitted. If the Zoning Enforcement Official shall decline to issue a zoning permit, he shall state to the applicant, in writing, his reasons for so doing. Unless a certificate of occupancy, as hereinafter provided, is issued for the structure or the use covered by the permit within two years from its date of issuance, the permit shall automatically lapse. The Mayor and Board of Aldermen, upon application and for good reasons shown, may renew the permit for a further period to be determined by the Mayor and Board of Aldermen. No use, excavation or construction shall be commenced until a zoning permit therefor has been issued.