Has there ever been a case where an Owners Corporation can force this type of owner to sell their property? Or, at least to re-instate/remove everything they have done?
I have never heard of the former and I doubt if it has ever happened – the right to property ownership is pretty much sacrosanct – but you can get to the same point by religiously enforcing all the by-law breaches that have led to this point, including seeking NCAT orders, until the miscreant wants to move of their own volition.
As for the second part – which is related to the first – the OC has the absolute right to seek orders at NCAT to protect and restore common property and that’s exactly the kind of totally reasonable action that might drive the recalcitrant out of your building (and make sure that whomever they sell to knows the issues have to be fixed).