The epicenter of the U.S. foreclosure crisis is shifting to New Jersey and New York, threatening a housing rebound in one of the country’s most densely populated areas.

New Jersey has surpassed Florida in having the highest share of residential mortgages that are seriously delinquent or in foreclosure, with New York third, a Mortgage Bankers Association report showed last week. By contrast, hard-hit areas such as Arizona and California have some of the lowest levels of soured loans after allowing banks to quickly foreclose after the 2007 property crash.