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Re:London: the city that ate itself by nosuchthing on Tuesday June 30, 2015 @02:48PM (#9807578)
>Why restrict these taxes only to unused spaces?

To create an incentive for unused spaces to be used, instead of horded.

>If you do so, you'll have to get around people only nominally using the spaces.

Who could pull that off? Someone who owns 4 houses?.. 10 apartment units?

Re:London: the city that ate itself by eru on Tuesday June 30, 2015 @11:25PM (#9809908)
How would the legal system tell apart used from unused spaces? How would you make that distinction hard to game for someone with expensive lawyers and resources.