Hurricane Sandy caused nearly $18.8 billion in property losses from Maryland to Massachusetts, affecting an area that produces 10 percent of U.S. economic output.

A year later, a report based on Guy Carpenter's on-site surveying shows the brunt of Sandy's damage fell on Mantaloking, NJ; Breezy Point, Queens; Long Beach Island, NJ; and Staten Island.

Sandy affected New Jersey and New York the most—at $9.6 and $6.3 billion in losses, respectively, according to the Insurance Information Institute (I.I.I.)—because the infrastructure was not built to withstand a historic mix of water and wind.

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