If the owner of any property in respect of which a notice as is referred to in section 320 has been given is prevented by the occupier from complying with such notice, the Board or civil area committee or the Chief Executive Officer at whose instance such notice has been given, may, by order, require the said occupier to permit the owner within eight days from the date of service of such notice to take all such actions as may be necessary to comply with the said notice and such owner shall, for the period during which he is prevented as aforesaid, be exempt from any fine or penalty to which he might otherwise have become liable by reason of non-compliance with such notice.