@Kovoschiz

Your view is too rigid and orthodox. Does this mean, when ref=H Wang Chi House is approved for return in some medium-term future, that the entire land suddenly "resumes" to be `=residential`? Even though there are no actual changes to the estate itself?

imo a brownfield is a place with "nothing" in it, which implies non-inhabitation. Or, it's a place where land usage is undecided. It should be painfully obvious Wang Fuk Court to this date is still a residential estate.