And mixed-use developments, with apartments over corner shops, mean people don't have to get in the car for every errand.

CNN: Gridlock drives developers to design wiser cities

If he wants to scapegoat Congress and the Federal government for shorting cities on housing, Bloomberg has an immense repertoire to choose from: the flat out failure of foreclosure policies, anti-urban transportation funding, lending that stifles mixed-use developments, and so on.

FORBES: Mayor Bloomberg Rezones the Mortgage Crisis

Few developments were hit harder in the real estate crash than this mixed-use project in the desert 20 miles southeast of Las Vegas.

WSJ: Green Shoots in the Las Vegas Desert