Condominium values in Boston’s core reached a record high during the second quarter of this year as eager buyers drove up sales, according to data­ scheduled to be released Tuesday.

The increase adds to mounting evidence that the state’s housing market is on the mend, housing specialists said.

“The feeling out there is prices are not going to soften anymore,” said Barry ­Bluestone, the director of the Dukakis Center for Urban and Regional Policy at Northeastern University. “We are seeing the real signs of a recovery in the housing market.”