BOSTON-Normandy Real Estate Partners has sold 99 Summer St., a 272,614-square-foot office building here, to Cornerstone Real Estate Advisors for $110.8 million, or $407 per square foot. Normandy had paid $68.2 million for the 20-story property in 2006 as part of a portfolio, and has since renovated its five-story atrium lobby and common areas.

Cornerstone, a subsidiary of MassMutual Financial Group, is among the world’s largest global real estate managers, the Boston Globe reported Thursday. It has a sizable stake in the Fan Pier redevelopment project in the Seaport District.

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