Multi-billionaire mining magnate William I. "Bill" Koch bought this compiund in December 2012 from Rachel "Bunny" Mellon the philanthropist and art collector.
http://realestalker.blogspot.de/2012/04/lets-talk-about-bunny-mellons-property.html
http://www.capecodtoday.com/news/EXTRA/2012/01/06/bunny-mellon-s-cape-cod-estate-600
http://blogs.wickedlocal.com/massmarkets/2012/01/31/bunny-mellons-exclusive-cape-cod-compound-hits-the-market-for-a-cool-28-7-million
http://curbed.com/archives/2013/01/07/bunny-mellon-unloads-epic-cape-cod-estate-for-195m.php