???house??? does not, as regards development of classes 1, 2, 3, 4, 6(b)(ii), 7 or 8 specified in column 1 of Part 1 of Schedule 2, or development to which articles 10(4) or 10(5) refer, include a building designed for use or used as 2 or more dwellings or a flat, an apartment or other dwelling within such a building;