Middle Class Can't Afford Liberal Cities

Across the country, rich, dense cities are struggling with affordable housing, to the considerable anguish of their middle class families.

Among the 100 largest U.S. metros, 63 percent of homes are "within reach" for a middle-class family, according to Trulia. But among the 20 richest U.S. metros, just 47 percent of homes are affordable, including a national low of 14 percent in San Francisco. The firm defined "within reach" as a for-sale home with a total monthly payment (including mortgage and taxes) less than 31 percent of the metro's median household income.