(Bloomberg) — When Hurricane Sandy roared through New Jersey two years ago, it not only tore up the shoreline. It also pushed out much of the middle class.

From Ocean City to Toms River, one-story cottages and bungalows damaged by the worst Atlantic storm on record are being replaced by multi-story homes that go for twice as much. Sales of million-dollar homes on the Jersey Shore surged to a seven-year high in the third quarter.

Sandy accelerated the turnover of existing homes to higher-priced ones, said Kevin Gillen, an economist at University of Pennsylvania's Fels Institute of Government. Meanwhile, those relying on insurance claims and government grants are sometimes unable to rebuild as quickly as their wealthier neighbors.

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