Fannie Mae was able to extract an $11.6 billion mortgage-repurchase settlement from Bank of America this year — its largest to date — because the bank needed Fannie's approval to sell billions of dollars in servicing rights.

That's the conclusion of a report set to be issued Thursday by the inspector general of the Federal Housing Finance Agency, Fannie Mae's conservator.

Fannie used its leverage in approving mortgage-servicing transfers to resolve a bitter dispute with B of A. The dispute reached its nadir last year when B of A stopped selling some residential mortgages to Fannie because of their contentious fight over mortgage-repurchase claims.

Fannie claimed many of the soured mortgages it bought from 2000 to 2008 from B of A and Countrywide Financial (which B of A later acquired) were defective at the time they were sold. B of A had countered that another settlement — which the report did not name — superseded Fannie's claims and exempted the bank from further repurchases.

The stalemate was broken after more than a year of meetings — and substantial differences in opinions about the values of the loans in question — when the two sides eventually agreed that B of A would pay $3.6 billion for loan losses, repurchase roughly 30,000 loans for $6.7 billion and pay $1.3 billion in compensatory fees for not foreclosing on borrowers in a timely manner.

"Nonetheless, Fannie Mae was able to bring Bank of America to the negotiating table due to the bank's interest in completing a significant sale of [mortgage-servicing rights] to third-party servicers," the report says. "Specifically, Fannie Mae would not consent to Bank of America's proposed transfer of the mortgage-servicing rights until B of A agreed to a resolution of Fannie's claims for compensatory fees."

In January, B of A announced the sale of more than $300 billion in mortgage-servicing rights on 2 million loans at the same time it announced the Fannie settlement. Nonbank servicer Nationstar announced it had bought $215 billion of mortgage for $1.3 billion, and Walter Investment bought $93 billion of mortgages for $519 million.

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