The new paradigm of urban social and economic rehabilitation is replacing the
current sprawl growth model. But four temptations must be considered:
1) The high-density. This process is possible in sprawl model, but its quantification does not
seem to be clear, because after a certain threshold of occupancy per unit area, the city seems to
collapse and social and environmental benefits disappear, appearing reversal processes city to
country in search of a minimum quality of life standards. There is not a model for appropriate
density. It depends on the way of life of population, the traditional city model.
2) The replacement. Architectonic and urban rehabilitation must be preferred to replacement,
except for certain cases to be legally taxed. But as the city cannot be densified and orderly,
without the prior replacement of the building, may fit this temptation. Even replacing the
building can be made without considering high building standards
3) The gentrification. There is a wide doctrine and experience about this phenomenon with
serious social consequences. It is very tempting to replace the building, due to improve
requirement of broad levels of quality, entering a game of speculation, so common in our real
estate market.
4) The eco-city. Comprehensive projects are building spaces with low levels of energy
consumption. Fall into this temptation means to continue the extensive city model we have been
developing, creating new cities far from the existing but incorporating saving measures, and
continuing resource consumption
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