4840 Westfields Blvd. in Chantilly, Virginia, is one of six suburban office buildings purchased by affiliates of Portnoy Family Office and being contributed to RMR's new office fund. RMR Group Inc. is launching a new office investment fund to which the Newton, Massachusetts-based alternative asset manager will contribute $100 million. In addition, the Portnoy Family Office, controlled by Adam Portnoy, president and chief executive officer...