If you're looking for how quickly that cash flow will payback your initial investment of liquid capital, that's IRR. 

However being a newbie I feel that my initial conclusion may be uneducated due to lack of experience.

So the initial capital we have now in my eyes and opinion is very important and I want to make sure we invest it with the right things in mind, right strategy, and in a way that is sustainable throughout future real estate investments.- Market = looking for single family homes, 3/2s or 2/1s in try he Philadelphia area since it is relatively close and away from the high NJ taxes.  

@Jonharold CiceroRecently started this initiative and so far I only got two quotes.

Owner says they owe $204K, want their initial down payment of $25K back.

This is odd because I obviously secured a loan when I initially moved into the area and there are other condo's that are being sold and have been sold recently.  

Don't forget to account for an initial capex hit if there is deferred maintenance.3.

The initial investment is more affordable, however the returns are all relative as well.

@Justin R.I assume that this Owner Contribution can be pulled back out of the business at any time, such as a point when I can take a mortgage out on the investment property, to pull my initial investment out?

With respect to refinancing when RE values are low, this is why we like to keep our LTV at 65%, when the 10-year balloon comes, our LTV is about 51% of its initial value.