Beautiful! Although 4 million seems not very expensive for a castle? On the other hand, it could likely need a LOT of repairs and updating.
$4M USD will get you something really nice, but not always anything particularly special in the San Francisco area. It will be interesting to see how Covid-19 affects real estate prices. In my area, everyone who had something on the market a week or two ago, took it off the market. There are 6 properties for sale in my little suburb and 3 of those are pre-foreclosure/auction. The two are land, and one is an overpriced house.
Hell, another couple I read about today rented a house that will cost that much in pre tax dollars every year, and still wont own it...so this is not a bad investment. With the world economy in the tank, if one has the wallet to go play, you can really get some good bargains at that end of the market. And Pierre falls into that category. The wife's family is extraordinarily wealthy too.