Future HQ of Alexion, PTC sells for $455M to Norges Bank, American Realty

The future Seaport District headquarters of Alexion Pharmaceuticals (Nasdaq: ALXN) and PTC (Nasdaq: PTC) has sold for $455 million to a joint venture of American Realty Advisors and Norges Bank Real Estate Management.

The seller was Skanska USA Commercial Development, which built the 17-story, 450,000-square-foot elliptical building at 121 Seaport Blvd. Skanska acquired the land in November 2013 for $36 million, according to a Suffolk County deed.

“121 Seaport’s unique and sustainable design…