Condominium values in Boston’s downtown core reached an all-time high during the second quarter of this year as eager buyers drove up sales, according to data scheduled to be released Tuesday. The median price in a dozen Boston neighborhoods — including Beacon Hill, Fenway, the North End, and South Boston — climbed to $515,000 during the three months that ended June 30, according to LINK, a Boston company that tracks the downtown condominium market. That marked a 7.5 increase compared with the same quarter in 2011.
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