BUZZ-Doral Financial Corp: Ends talks without settlement
** Lender's shares fall 20.4 pct at $6.65 premarket
** Ends negotiations with Puerto Rico treasury department without settling claims related to a lawsuit
** Doral sued the government in June for voiding an agreement that required the treasury department to pay it about $230 mln in tax refunds
** Court of First Instance schedules trial for Sept. 16, 17 and 18
** Up to Monday's close, the stock had risen 147 pct since June 5 when the company sued the government
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