I agree why don't we just make a extremely burdensome property tax for non-primary residence properties that are not worked/workable land such a farm land? Maybe 5x property tax on your second property, 10x on your third, etc. Maybe it only kicks in and ramps up after a set number of months to allow developers to buy properties and develop them for sale but make it hard to hold them for too long in order to get a 'legit' owner in the house who will actually make it their home.