If the Director of Inspections finds unsanitary conditions in any restaurant that are immediately dangerous to the health of the general public, he or she may immediately suspend the license of and close the restaurant until such unsanitary conditions are corrected, following which he or she shall give a written notice in a reasonable time to the licensee or the responsible representative in charge stating his or her reasons for closing the restaurant. No person shall continue to operate a restaurant after receipt of such written notice.