OPPORTUNITY KNOCKS: Warren Buffett’s Berkshire Hathaway has offered to buy the loan portfolio and mortgage division of Residential Capital, which recently filed for bankruptcy protection.

BETTER BID: Berkshire says its bids are superior to competing ones from Fortress Investment Group and Ally Financial. It says its $2.4 billion bid for the mortgage unit is better than Fortress’ because it has a lower breakup fee and no expense reimbursement charge. Berkshire says its $1.45 billion bid for the loan portfolio is better than Ally’s $1.4 billion offer.