I personally say why discriminate against foreign buyers and how about we slap any investment property with commercial property tax? I don't care if you are from Abbotsford or Azerbaijan. It will push revenues up for the cities.
Could also explore it as a new funding source for translink...
CBC Doczone recently did an interesting piece on the Toronto market and made a very valid point that the condo market is a commodity play more than anything.
http://www.cbc.ca/doczone/episodes/the-condo-game