Save up the down payment for the next duplex, but it as an owner occupied house, and turn the first into a pure rental. 

Pure Gold.

Quote from @Joy Shaw: My wife and I are expecting our first child in June. 

@Christopher Pearson,Purely my opinion ...You'd be better of getting educated yourself.

This first one i am purely purchasing it from him for a good deal, however my end goal is to be the one who holds the properties and have him build and pay him according to a cost plus type contract.

The fact that more owners will follow this path is purely speculative on my part and I may be way off base.

or Pure investment. 

I really look at RE as a pure investment and subscribe to the your home is a liability principal.

But, like the name indicates, it's pure speculation if this ferry terminal, or that bullet train, is ever actually going to get built.

I guess the GFC created that tag line.. for me personally I want to buy at one price and sell at a greater price.. if i cant then why buy it.. even if its negative cash flow.as a land developer speculator.. we are all about negative cash flow.. its the basis of our business.. but then when we hit it right we make some nice profits that exceed anything that could be made on pure cash flow with the same dollars invested and over a given time period thats why one simply has to look at IRR to get a true picture not just cash flow