Best way to use $50K?

[Keri Middaugh]

We own 2 single family rental properties that are cruising along just fine, and we'd like to expand our real estate portfolio.  We also have a private lender who is willing to loan us $50,000 for our next purchase(s).  My question is this: what is the best way to maximize this money to really jump start our portfolio?  Buy a very modest single family home in a cash deal? Use it as five $10,000 down payments on 5 modest single family homes (and mortgage the rest of the purchase prices)?  Use it as a large down payment on a multiunit property?  We'd like to generate enough passive income to leave a job within the next 5-10 years. Thank you!