Among the more interesting and important land use questions of the 21st century: what's in store for the expanses of conventional suburban subdivisions that define much of the metropolitan area land use across the United States? The mortgage crisis dealt a serious blow, hammering many existing subdivisions with high foreclosure rates and crippling many incomplete or uninhabited neighborhoods with half-finished infrastructure, or completed infrastructure but no homes, or homes but no owners ("zombie subdivisions"). Rising transportation costs will increasingly take a toll