I live in Sydney and I wouldn't buy any property built since 1970 and especially any property built since 2000.

I have friends in the industry and the horror stories they tell me are shocking. The real problem is coming in a few years as the waterproof membranes protecting the rebar in all these high rise buildings has in almost all cases not been put in correctly - in 10 to 20 years the concrete cancer will be so bad that these building will need to be demolished.