As CoolBFWagon said, the Chinese are a huge country, becoming very wealthy, and they like investing their hard earned in a stable country in bricks and mortar that is safe. Property is very expensive there in their big cities, and Australia is good buying for them.
So Sydney, Melbourne are seeing big inputs of Chinese purchasers.
Also, SMSF re now being used to purchase properties which further increases prices.
So the older more well heeled are further using negative gearing/SMSF to buy property and cash in on capitals returns, and in effect will have the young slave away to pay for their capital gains, all while getting the young to pay their rents as the young cannot get into property.