Don't rely on people moving back to our old cities
Just as all successful home extensions steer clear of the kitchen, so do all successful development plans steer clear of cities. Once you start tinkering with cities it is the same as tinkering with a domestic plumbing system. Soon you have to turn off the water, re-route the drainage, muck about with the gas and fight with the electricity. Every utility gets involved and - conventional wisdom to the contrary - getting every utility involved is a recipe for ruin, not for home improvements.
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