In 1964, Jane Buntin conveyed to the Ladies Hermitage Associ…

In 1964, Jane Buntin conveyed to the Ladies Hermitage Association (LHA) the Tulip Grove house, originally built by President Andrew Jackson’s nephew in the 19th century. The conveyance stated that LHA “shall own Tulip Grove provided that LHA pays to Buntin at least $600 annually in gate receipts received from tourists visiting Tulip Grove.” What property interest do Buntin’s heirs have in Tulip Grove?