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Federal suits filed in October 2001 determined that the most Silverstein could collect for losses sustained in the September 11 attacks would be $4.68 billion. Insurance companies have already paid about $2.55 billion, and the settlement resolved the remaining sum. Spitzer's office said that the settlement, which was the biggest obstacle to reconstruction at the World Trade Center site, "will save additional tens of millions in legal costs and allow the Port Authority and Silverstein Properties to focus on rebuilding at Ground Zero." Prior litigation has cost Silverstein and the insurance companies hundreds of millions of dollars.