The Bay State’s desperate housing market delivered more bad news last month as sales of single-family homes fell to their lowest level for May in nearly two decades.

Last month, 3,256 single-family homes were sold, down about 13 percent from 3,749 a year earlier, according to a new report from the Warren Group, publisher of Banker & Tradesman.

“That’s a significant drop and it worries me,” said Karl Case, an economics professor at Wellesley College. “The region is still struggling with lots of unsold properties, and the housing market is not stabilizing.”

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