From reading the responses above, investing within 10kms of the CBD seems to be widely accepted by many investors as well.
Over the years I've come to understand that investing is multi dimensional, taking into account capital growth, yield and strategy.
You have had great success investing in inner city, good for you, Btw I have IPs in inner city Too. I am not poo pooing it, just trying to stress that with everything its supply and demand, timing is the key. Therefore 10km will not always provide best opportnities for growth