Citibank's strategy to increase its presence in the jumbo mortgage market appears to be working — applications in the sector are up 60% in the past 60 days, according to sources familiar with the lender's operations.

Citi has not revealed how many of these mortgages have been approved yet. In April, the New York banking giant made the offering of jumbo mortgages a top priority for its U.S. retail branches — and it came at a time when it stopped funding jumbos through loan brokers.

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