When my wife and I toured Twin Towers in Feb. 2012, we were impressed with the art gallery housing classical paintings. It turns out that six of those paintings are fairly valuable and are being auctioned by Sotheby's on Nov. 8.
The most valuable of the paintings is "LA BRANCHE DE CERISIER (THE CHERRY BRANCH)" which is expected to fetch $1.5 to $2 million.
(Sotheby's issued a press release on Sept. 18 about the sale but, for some reason, it's not with the other press releases on their website. I have asked them for help with this.)
Although the sale will raise money for Twin Towers, it will hopefully also get these paintings into a museum environment with the proper controls for their preservation. And the paintings won't really disappear from Twin Towers; they will be replaced by high-quality reproductions.
More details as I get them...