The "Rockefeller Archive Center", an independent foundation that was until 2008 a part of Rockefeller University, is a vast three-story underground bunker built below the "Martha Baird Rockefeller" "Hillcrest" mansion on the family estate at Pocantico (see Kykuit). Along forty-foot-long walls of shelves on rails, maintained by ten full-time archivists, is the entire repository of personal and official papers and correspondence of the complete family and its members, along with historical papers of its numerous foundations, as well as other non-family philanthropic institutions. These include: the Commonwealth Fund, "Charles E. Culpeper Foundation", "Lucille P. Markey Charitable Trust", and the "John and Mary R. Markle Foundation".