If the person served is not the sole owner of the lot, or does not have authority as agent for the owner to bring the lot into compliance, such person shall, in writing, notify the officer by whom such lot is held of the name and address of the owner and all other persons that are known to him to claim an interest in the lot. Any person that is served with such a notice of noncompliance is liable for any loss which is sustained by such owner or other person whose name and address he has knowingly concealed from such officer.