I'm looking to continue to build an income producing portfolio across different asset classes.As a side project, I'm starting a business that will connect farmland investors with farmland deals.  

I was wondering what search criteria has produced the best subject-to financing results?

Typically you'll find them to produce owner finance or lease option type deals.  

If you want to look at a 3-unit or 4-unit with a conventional loan, you will need a minimum of 25% down.I suggest you get the 2 to 4 unit property because of the relatively higher income they produce per dollar of purchase price.  

However, it would be a great turn of events if the combination of the two would allow combined resources to produce a better algorithm to formulate a more accurate price range.  

multiple sfh in a lower middle class neighborhood that each would produce about 100-250 cash flow per house.

I currently send 18,000 post cards a month, and it produces a good amount of leads, but very few of these leads are motivated.

Income producing properties are a cash on cash game.

If I am requesting a rent roll or lease I think 24 hours is a reasonable time to produce it.We are buying a portfolio and they include 6 months on repairs, PM, and will pay rent if a tenant doesn't.

I am thinking of isolating a number of solid income producers in one entity, and having them mostly debt free.