Rather than make it a rule, tax it. For example in Australia there is CGT on an investment property apportioned to the time it acted as such (as apposed to pri

Rather than make it a rule, tax it. For example in Australia there is CGT on an investment property apportioned to the time it acted as such (as apposed to principle place of residence). CGT is fairly lame in Australia with both a 50% discount and perhaps you need not pay it for 1000 years if you keep passing the property down through family. Land tax and vacant property tax would help motivate thought!