A thoughtful response MikeOlivo-Moore. Perhaps the very advantage of high-rise residential buildings is that they increase density while killing vitality. Space, both physical and psychological is essential to livability. By increasing density you get the advantages associated with density, while suppression of street vitality gives people greater physical and psychologicl space per capital per sq km. Cold weather also kills vitality and that may actually be an advantage to think about here in Toronto given our cold climate. Go to any bursting developing nation city when it's +30 outside and come back and try to argue that density is a good thing.