Whenever the Building Inspector has reasonable grounds to believe that work on any building or structure is being prosecuted in violation of the provisions of the applicable building laws, ordinances or regulations or not in conformity with the provisions of an application, plans or specifications on the basis of which a building permit was issued, or in an unsafe and dangerous manner, he shall notify the owner of the property, or the owner's agent or the person performing the work, to suspend all work, and any such persons shall forthwith stop such work and suspend all building activities until the stop order has been rescinded. Such order and notice shall be in writing, shall order the remedying of any condition found to exist in violation of the State Building Construction Code and shall state the conditions under which the work may be resumed and may be served upon the owner or his authorized agent personally or by sending by registered mail a copy of such order to the owner or his authorized agent at the address set forth in the application for the permit.