No tractor used for towing a trailer, construction equipment, including, but not limited to, bulldozers, backhoes, flatbed trucks or trailers for hauling same, trailers normally pulled or towed singly or in tandem by a motor tractor of the type normally used for towing trailers or vehicles having a gross vehicle weight in excess of 10,000 pounds, whether or not in a space enclosed or covered, shall be stored or parked overnight in any residential district; provided, however, this section shall not apply when such equipment is in current use on the lot or premises on which it is stored or parked in actual performance of work authorized by a valid current building permit or permits.