One thing they've definitely learned from the mistakes in the postwar era is not to ghettoise the poor. You save much more costs in the long run if you invest into a mixed community with proper infrastructure, desirability and social dignity. Thus new social housing is mixed into middle income or even luxury housing schemes (15-40%). I used to live in a luxury apartment in a new development, one of whose streets was all social housing. There was almost no difference in architecture (or space inside) other than their lack of front gardens and minimal landscaping, though all residents were entirely free to make use of the parks and lakes that dotted the development. The only thing you could tell the difference was that suddenly you saw all the residents hanging outside, with kids playing in the streets all day (and many of the rich kids and poor kids hanging out together).
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