I think there are safety aspects in going so high now, I would expect the fire service to object to anything above what their ladders can reach.
Even on green belt land intrusion would have to be considered, there are restrictions on windows with clear glass overlooking existing homes, or you would have to build the flats a distance away from homes, although this land could be a carpark or garages it would add to the cost.
In the past these flats were council owned who picked up the cost of maintenance, in owner occupied flats this cost of maintaining gardens, stars, lifts, window cleaning and a permanet rota of security guards could get very expensive on top of a mortgage.
Rabbity girl Are you going to restrict these homes on green belt to locals or are they to be sold to people who want another home for weekends in the country or speculators buying whole estates just to rent out.
I paid a premium for my house as I overlook two large fields and a small tree surrounded lake, today like most summer days there has been a large herd of milking cows and 2 bulls in one field, right behind my house, I much prefer that to the pink shell-shaped house with polystyrene walls that Kevin McCloud enthuses over .
My milk is delivered, it comes from a local dairy, in glass bottles, collecting in the local area . You don't have to buy from the supermarket.