BOSTON—Rack up another major commercial office buy for Rockpoint Group, LLC. The firm has increased its portfolio here with the acquisition of the 99 Summer St. office tower here.

Rockpoint, a real estate private equity firm headquartered in Boston, acquired the property from Cornerstone Real Estate Advisors of Hartford, CT for an undisclosed sum. The deal for the 20-story, 270-000-square-foot office tower marks the third significant purchase by Rockpoint in 2015 with another major transaction in the works at press time. At the time of purchase, the property was 95% leased.

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