It shall be the duty of the Zoning Officer to enforce Section 54-30 and pursuant to that duty to investigate any violation or alleged violation of this article coming to his attention, whether by complaint of third persons or from his own personal knowledge or observation. When any building or structure is erected, constructed, altered, repaired, converted or maintained or any building, structure or land is used in violation of any provision of Section 54-30, it shall be the duty of the Zoning Officer to proceed with the enforcement of this section and the penalties provided for hereunder. He may also pursue such other statutory method or methods, heretofore or hereafter provided, as may be open to him.