Harbor Trading USA, a California corporation that serves as the U.S. investment vehicle of the Berlin-based Süsskind & Rokeach family, entered downtown Boston with the acquisition of 148 State St. from Taurus New England Investments Corp. for $41 million, or approximately $765 per square foot.

The 53,598-square-foot, 11-story office building serves as the global headquarters for Public Consulting Group (PCG), an organization that provides management…