Residential Capital Corp. — which is on the auction block — posted a $4 billion loss in the fourth quarter after reclassifying some of its troubled mortgages and being forced to repurchase loans from Fannie Mae and Freddie Mac.

A year ago, the GMAC-owned ResCap lost $790 million. GMAC is trying to unload several billion dollars in troubled loans held by ResCap and said in a statement Thursday that it continues to "explore strategic opportunities" for the unit. Loan repurchases by ResCap cost the company $573 million in the 4Q09. It also marked down the value of its mortgage servicing rights by $122 million. (According to the Quarterly Data Report, ResCap ranks fifth nationwide in terms of housing receivables with $380 billion.)

Subscribe Now

Access to a full range of industry content, analysis and expert commentary.

30-Day Free Trial

No credit card required. Access coverage of the securitization marketplace, including breaking news updated throughout the day.