It's not hard and fast though which is why I suggest you go see a broker and get some hands on information.
You would be getting 2 loans so the vals might come in differently and there are banks who approach it more leniently.
I think it would be possible get better than 80% LVR on 3 dwelling deal. I agree that valuation will be done inline and therefore max value may be $960k HOWEVER I think BLTN through a good broker should be able to get 85 or 90% LVR
At 85% LVR it would be $816k = 384k skin in the game
At 90%...