The market is hot for housing, particularly outside the cities.
A lot of KHs in the US were built on cheaper suburban land.
However, a hall is not housing and the market doesn't seem to be very rewarding for buildings that pack a lot of people in right now.
From a real estate point of view, it might be better to wait until the market improves.
The problem, as Anna Marina mentions, is that uninhabited buildings don't exactly wear well.
Actually, I'm waiting for an announcement to the effect that, "The home Zoom video worship arrangement has been so successful that it's obvious that Jehovah wants us to use this arrangement exclusively going forward. Aren't we thankful, brothers?"