All nonconforming uses and nonconforming structures in existence on the effective date of this chapter shall be registered with the Zoning Officer within 180 days from said effective date. If by amendment a use or structure which was lawfully in existence prior to the effective date of said amendment becomes, by operation of that amendment, a nonconforming use or structure, such nonconforming use or structure shall be registered with the Zoning Officer within 180 days from the effective date of the amendment. Any nonconforming use or nonconforming structure not registered within said one-hundred-eighty-day period shall be deemed to be discontinued at the expiration of said one-hundred-eighty-day period for the purpose of this chapter. Registration shall be accompanied by a completed registration statement in such form as the Zoning Officer may prescribe. It shall contain a description of the existing use and existing structure, a designation of the zoning district and such additional information as may be required by the Zoning Officer. Before permitting registration of any nonconforming use or nonconforming structure, the Zoning Officer may, at his discretion, examine or cause to be examined all buildings, structures, signs or land and portions thereof for which the proposed registration statement has been filed.