Moody's Investors Service lowered ratings on about $300 million of Source One Mortgage Corp.'s securities, saying the company's recent buildup in subservicing may not be sustainable.

Source One, of Farmington Hills, Mich., quickly became one of the largest subservicers in the nation earlier this year, when it sold $17 billion of its servicing portfolio to Chase Manhattan Mortgage and agreed to subservice the loans for Chase for at least a year.

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