David L. Kalkbrenner's phone has been ringing off the hook since the Financial Standards Accounting Board voted last month to eliminate pooling- of-interest mergers.

His company, Greater Bay Bancorp in Palo Alto, Calif., has tripled its assets in the last 18 months by buying small Northern California banks. And with the FASB rules set to take effect in less than two years, Mr. Kalkbrenner is suddenly fielding more calls from community banks that may be looking to sell.

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