Exhibit 21.1 Subsidiaries of the Registrant Beacon Capital Partners - -------------------------------------------------------------------------------- Beacon Venture Partners, Inc. - -------------------------------------------------------------------------------- Beacon Venture Partners, L.P. - -------------------------------------------------------------------------------- Beacon Capital Participation Plan, L.P. - -------------------------------------------------------------------------------- Beacon Capital Participation Plan, LLC - -------------------------------------------------------------------------------- Beacon Capital Partners Management, LLC - -------------------------------------------------------------------------------- Beacon Capital Partners Acquisition, LLC - -------------------------------------------------------------------------------- Cambridge Kendall SPC, Inc. - -------------------------------------------------------------------------------- Cambridge Athenaeum, LLC - -------------------------------------------------------------------------------- Kendall Athenaeum, LLC - -------------------------------------------------------------------------------- One Kendall, LLC - -------------------------------------------------------------------------------- Beacon/PW Kendall LLC - -------------------------------------------------------------------------------- Technology Square LLC - --------------------------------------------------------------------------------