Survey: SF among places where it's cheaper to rent

The survey from the real estate search engine Trulia confirmed what most already know-- it's generally more affordable to buy than to rent.

However, San Francisco may be one of the few exceptions.

The survey looked at the 50 largest cities in the United States.

In 72 percent of them, Trulia concluded home ownership is more affordable than renting.

The exceptions are New York, Seattle, Kansas City and San Francisco.

Trulia reached its findings by comparing the median list price in a city to the median rental price.