There are things like master metered power/gas if you have it, certain types of sewer lines, bad roads etc. that could end up being expensive.

If you have negotiated a lower price than what the tool tells you your purchase price is, you can adjust your profit, or add more into your contingency for rehab costs (this is where I tend to apply it).  

My two other partners  NO way to the tenth power would they ever give a home they owned to someone else to list  LOL...

Tell Lars that Chris Mason sent you.http://larsghanssoncpa.com/ When his office and mine get conspiratorial with the goal of boosing purchasing power of a self employed person a tax filing or two out because someone's purchasing power is artificially constrained by stupid mortgage guidelines, amazing things happen.

Our thought is that by buying rental properties, and improving our portfolio we will have a lot better borrowing power.

Look under Tools in the right hand corner.

@Brian Gibbons may have some more complex options than these, but these are the basic creative finance tools in my toolbelt.

He has great tools that come along with it to help calculate the costs.  

I had a cat with kittens locked in a garage once, it was all a scam to get cash for keys since they read online that animals+power on=occupied.   

Such a great tool.