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BOSTON — Affiliates of Boston-based Rockpoint Group LLC have acquired 99 Summer Street, an office and retail building located in Boston. Cornerstone Real Estate Advisers sold the 20-story property for an undisclosed price. The 270,000-square-foot Class A building was 95 percent occupied at the time of sale. The property will be managed by a Rockpoint affiliate, Rockhill Management, which provides property management and related services for investments made by Rockpoint-sponsored funds.