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BOSTON — Skanska USA has topped out 121 Seaport, a 17-story, 400,000-square-foot office building under construction in Boston. The construction milestone marks the completion of the building’s steel frame. Designed by CBT Architects, 121 Seaport is scheduled for completion in the first quarter of 2018. The property is located in Boston’s Seaport district across from District Hall and Seaport Square Green. Its three-story lobby will face Boston Harbor and open onto Harbor Way, a 70-foot-wide pedestrian street. A team of nearly 200 construction workers has put more than 35,000 hours into the project to date.