If cash is off the table which is sounds like it is, then making yourself look like a true business is important. 

@Matt Slease - When using seller financing, everything is on the table for negotiation.

My answer would be to find the deal, or raise capital and bring that money to the table.

I read through most of the other responses and I would have to agree that you need to have a deal on the table to get other parties involved with your project.

Get yourself and amortization table and make 15yr payment amounts every month and check the box for the additional payments to go towards principal. 

@Jared MontBlanc, Almost everythings on the table for you! 

The only limitations I can think of which will inhibit growth is a dropping water table, and lack of labor force to work in the service industries.  

On single family, you may only need 20% down, although with lending these days and recent changes to Fannie and Freddie it DOES sometimes make more sense to bring more to the table for a lower interest rate (25%).  

My friend Peter Lohmann made this table which contrasts some of the options with a traditional security deposit.

Owned for a total of 90 days from closing table to closing table.