     property_method, 
     property_unit,
     date_from, 
+    date_to,
     property_type  || ' / ' || property_sub_type
 
 UNION

    property_method, 
    property_unit,
    date_from, 
    property_type  || ' / ' || property_sub_type

UNION

    property_method, 
    property_unit,
    date_from, 
    date_to,
    property_type  || ' / ' || property_sub_type
);

