Social Finance, the online lender that made its name refinancing student loans for high-earning millennials, is doubling down on mortgages as rising interest rates are expected to make originations scarcer.

The San Francisco startup is set to announce Tuesday that it has obtained a mortgage license in New York and that its origination volume hit $1 billion in October. The company's monthly originations of home loans surpassed $100 million in December, it says.

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