Skanska USA Commercial Development Inc. sold a 17-story office building in Boston for $455 million to a joint venture of American Realty Advisors and Norges Bank Real Estate Management, the Boston Business Journal reported.

The 450,000-square-foot building at 121 Seaport Blvd. will have Alexion Pharmaceuticals Inc. and PTC Inc. as tenants, the publication added.

According to the publication, WS Development Associates LLC also owns 50,000 square feet of retail space across two stories in the building.