Come to Vancouver if you want the answer to your question. They are being built for and bought by offshore buyers most of whom are from mainland China. Some of the money is illegal and is being laundered through the Canadian real estate market. Some of the money is legal but the buyers want to get their cash out of China and invested in a safe and stable country like Canada. Whatever the reason the impacts are being felt by locals who cannot afford to compete with these offshore buyers who for the most part do not pay Canadian income tax. Sadly, governments at every level have had their snouts in the trough for years in a desperate attempt to collect more and more offshore cash. Montrealers should look at Vancouver as a warning to what happens when you sell your land to the highest bidder.