Benjamin Lawsky, head of New York's muscular Department of Financial Services, is raising concerns about the explosive growth of mortgage servicer Nationstar, claiming the company may have "capacity issues that put homeowners at risk."

Lawsky sent a letter Wednesday to Jay Bray, the president and CEO of Nationstar, questioning the Lewisville, Texas, mortgage servicer's rapid growth and ability to service loans for borrowers in New York.

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