I would use apportionment to determine their share of communal space across all the apartments. Any communal space in apartments in theoretically available for all the apartments to use, so they should be allocated an equal share of the communal space in my view. I have not had to do this, so cannot show a worked example, as our CIL rate for apatrments for £0 per square meter. So developers are unconcerned about the floorspace and the social housing relief in those instances here. However, just as we apportion demolished in use floorspace across a development (or phase etc) then I think the logical conclusion is to take the same approach for communal areas in apartments.
