We've bought 150+ units and still own and manage 51 units on top of managing for other people in Jacksonville and Orlando so we know a ton about owning properties and managing them (at least from a traditional long term rental stand point).

If looking for 2 - 4 unit properties, you can acquire these through traditional paths like you found your current investment.

A good question to ask yourself is; why don't they just get a loan from a more traditional lender?

These tend to rent for a higher rate than traditional long term contracts. 

Private lenders allow for much more exposure to a borrower than traditional banks do. 

These days I bet because no one builds them they probably cost more than a traditional. 

@Jay Shah I'd recommend running the deals based upon what you could rent the house for currently as a traditional rental, if your plan is not to live in the house for more than a year or two.  

I am fairly certain no longer needs funding, but for any others that stumble across this post since it has been resurfaced, you need to know that Unsecured Borrowing is not allowed by any traditional loan options (fannie, freddie, USDA, FHA, VA). 

This method provides several advantages against a traditional manager as I can cater my service and fees to the individual needs of my owners. 

If you finance the purchase of the land through a traditional source bank/credit union most will require at least 20% down.