There are lots of ways to do this - many are described in Brandon Turner's book, The Book on Investing in Real Estate with No (and Low) Money Down.  

@Omar Ruiz, what you are describing is not partnering, it is simply buying a deal from a wholesaler.  

Some the things listed will not apply.PS  The reason I mentioned talking to a lawyer is because what you are describing has lots in common with mortgage fraud scams. 

But the deal you described already has plenty of cushion.. 20% down plus a discounted price, so.

The underlying idea of what @Chris Mason described above is to get around the usual seasoning issues connected to monies for a "down payment", correct?

@Jared Burnett - There are hard money lenders that only want to do purchase deals but you'll find that many of us are "hard money rehab lenders" that fund exactly as you described on a rehab project.  

Given the situation you described with various boarded up & vacant MFs in the area, you definitely need to pull some comps for similar properties in the immediate area.  

I'm thinking outside the box here, and we'd definitely keep loan contingency in place until this was signed off by underwriting, but maybe if you had a NAM (link for those that have never been in the Naval service) where the citation described your excellent management of the BEQ over the last two+ years I'd be able to sell it to underwriting.I know if I just tried to say "oh he was a company gunny, here's what company gunnys do" I'd get massive pushback from underwriting because that description of what a company gunny does is not specific to this particular exact borrower and doesn't have his name on it.

This is why property A can be bought at the lowest price due to only 2 out of 9 units are currently rented, however it's in a rural area which can influence future vacancy and, as I described, in a best case the rental income per square meter (or square foot) is the lowest of the 3 deals. 

From what you describe, in my mind, only one of the two scenarios really makes sense.