WASHINGTON — The Treasury Department Friday rejected a proposal for Fannie Mae to sell $2.6 billion, or roughly half, of its unused low-income housing tax credits to two unidentified investors believed to be Goldman, Sachs & Co. and Berkshire Hathaway Inc.

The Obama administration told the government-sponsored enterprise that the sale would result in a loss of aggregate tax revenues that would outweigh any savings to the federal government, and that blocking the transaction would better protect taxpayers.

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