Residental Capital, the mortgage lending unit of GMAC, said today that it needs as much as $1.4 billion in cash by the end of June in order to meet liquidity demands, according to a regulatory filing with the Securities and Exchange Commission.

ResCap initially estimated it would only need to raise $600 million by June 30, but an inability to close asset sales and losses on some hedges raised the amount to $1.4 billion.

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