ShareMost Expensive Listing: Boston, MA By Jim LowensternPosted Thursday, Mar 1, 2012 306 Darmouth Street Boston, MA 02116: Suffolk County Click here for the listing Office: Campion & Company Fine Homes Real Estate Agent: Tracy Campion Tags most expensivebostonmassachusettscastlescastles unlimiteddartmouth streetsuffolk countygreater bostonmillion dollarlistingnewTracy Campioncastles magluxluxurymamassnewtonNewton, MA