They’re to be dismantled. “It’s hard to argue with such a progressive agenda, but it’s harder to understand why these historic and much loved indoor display gardens, so dear to Ms. Duke’s heart, cannot coexist with the native plants and the bike trails. Yes, these glass buildings are now inefficient and cost a fortune to heat, but we are talking about one of the richest foundations in America — one that has committed ‘several tens of millions’ to this new greening of the park and part of whose mission, as stated on the front page of its Web site, is to preserve the cultural legacy of Doris Duke’s properties.”