The Wickham-Hakuba Estate in London:

If you thought the one in Japan was bad, the one in England is absolutely ridiculous. Granted, Hakuba’s mother inherited it, and it’s been in the family for a very long time. It’s constantly being renovated and improved, too, as she hosts events there on a regular basis. Large, ritzy affairs for charities and organizations to have their benefit parties. It boasts a ballroom, large dinner/reception area, sitting rooms, dozens of guest rooms, indoor and outdoor pools, expansive grounds and gardens, a lake, and so on. Excessive, yes, but his mum puts it to good use. Currently, the only people living there are Marion (his mother) and the staff – groundskeepers, maids, cooks, etc. 

Also, it’s actually only barely in London at all, technically speaking… about as far south-west as you can get. That’s one of Hakuba’s favorite things about it – it’s far enough away from the city to be nice and private, but close enough that they don’t have to go far to be back in the thick of it. 

Even better – the stone dividing wall around the property backs up to a nature preserve and, as a child, Hakuba found a section behind hedges where it had fallen apart. Thus, roaming wild woodland was an easy thing for him to do, and he did it often.