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There's two things going on here:
as BQ says, people just expense the shit out of everything and the tax take drops
The French don't let anyone in* and they don't like foreign buyers; the cost of housing is largely defined by demand and there isn't any, by design, except for the obvious hot spots
The two aren't related, the policy on charging CGT on property profits does not contribute to lowering demand, it just lowers the tax take.
* in comparison to our historically liberal immigration policies
This seems a good result to me. Why should the value of property continually rise 100x faster than GDP or wages??