You really can't limit the oversea money flow from this side, do you want to refuse foreign investment? The only thing you can do is to exchange information with Chinese side, since quite some of the money movement is illegal in China. But then there is political correctness involved, I don't think people here support the exchange information with Chinese.
So basically you have to face it with little choice. As far as I know, large portion of real estate money is from China, since no Chinese can make such sum of money in such short of time. The money is poured here because the house price is still thought cheaper compared with China.