Costs of development

Hi all,
I'm toying with the idea of buying a block than can be subdivided in the future, I'm trying to get an idea of the costs involved to build say 6 units in a Perth suburb.

3 x 2 units in the area are selling for about $170k
I think the following items would cover it, can anyone fill in the blanks, or add any extra costs.

Building 6 units x ?? ea =
Landscaping, paving etc =
Sewer headworks =
subdivision/strata costs =
Land cost =
Profit = ??

Venture Capital

Hi Kim

This sounds like an interesting proposition.
What suburb is the intended subdivision in?

Please send me the details via email if you are seeking to raise venture capital.