Discarding Suburbia

Although in my initial proposal I used the word 'suburbs' & 'sub-urban', after Russells comments on this, as he described it, a "charged word", I have decided that suburban communities are not the typology I want to focus this project on. To develop on my initial idea I want to look at the idea of density. It would not be a far fetched concept to propose the type of buidlings I am thinking of on a 700sqm block of land in the suburbs. I think it would push the concept & the project harder to explore the limits of how dense these ideas could be applied to. Although at this point I dont think I want tojump into high density, such as the Sydney CBD typ of density, but more along the lines of medium density, like the suburbs on the fringes of the CBD (ie/ alexandria, roselands, paddington, green square, etc.) How densely could we have populated these areas without clearing the natural landscape? If the landscape in these regions of Sydney were still the same as the landscape of the Royal National Park (as they once were 200 years ago) how close could we get to the current density?