Sheriff Leo McGuire presides over foreclosure auctions in Bergen County, New Jersey, where the bidding for a home reached $1.2 million last June — a record for one of the wealthiest counties in the nation. Homes sold on the auction block for as much as $852,000 this month — more than quadruple the median home price in the United States. County officials believe they are close to setting another record soon. In Troy, Michigan, Dorothy Guzek, a credit counselor since 1988, has also seen the changing face of foreclosure. Her clients, while predominantly poor and minorities, increasingly are neither. Nowadays,...