By Laura Kusisto | The Wall Street Journal
Across the country, a divide is emerging between cities that are growing outward and remaining affordable and ones that are hemmed in by geography and onerous zoning codes and are becoming more and more expensive.
As a whole, U.S. cities are expanding as rapidly as they have throughout the last half-century. From the 1950s until the 2000s they have added about 10,000 square miles per decade, or an area roughly the size of Massachusetts, according to research by Issi Romem, chief economist at real-estate site BuildZoom, to be released Monday. But beneath the surface a divide is deepening.