That's a good stick, yep. They could also add in a carrot, to reduce capital gains on sale of non-primary residences. There are too many incentives currently

That's a good stick, yep. They could also add in a carrot, to reduce capital gains on sale of non-primary residences. There are too many incentives currently to hoard properties like the damn monopoly man, so you need to start clawing away at them. Taxing the eventual sale just encourages people to not ever sell, so tax them for hoarding directly.