BOSTON — Newmark Knight Frank has arranged the sale of an office building located at 55 Seaport Blvd. in Boston’s Seaport District. Boston Global Investors sold the property to a member company of Zurich North America for $23.5 million. Constructed in 2016, the 13,500-square-foot office and retail building is fully leased to Boston Global Investors. Robert Griffin, Edward Maher, Matthew Pullen, Justin Smith, James Tribble, Samantha Hallowell, David Martel and Jonathan Martin of Newmark Knight Frank represented the seller, while Roy Rosenbaum and Sean Bannon of Zurich Alternative Asset Management advised the buyer in the transaction.