6N.I.In the case of a building or other land which, at a material date, was used for a purpose falling within any general class specified in any paragraph of Part II of Schedule 2, or which, being unoccupied on the date of the passing of this Act, was last used (otherwise than before the day beginning the period of five years ending with that date) for any such purposes, the use of that building or land for any other purpose falling within the same paragraph.