You can find a property owner of a "C" quality property that is at least one of the following:
-Tired of landlording.
-Retiring.
-Has little or no equity, or is even slightly upside down.
Sometimes they can be persuaded to do one of the following:
-Sign a master lease with you.
-Sign the deed over to you "subject to" the existing financing.
-Sell to you on a wrap mortgage with alternative down payment collateral (a car, boat or timeshare in Mexico or even a 2nd mortgage on your home). If you don't have cash-you'll need to get creative!
There are many books written on these solutions for more detail.
You want the "C" properties because "A" and "B" quality owners likely won't be receptive to you--those properties sell themselves in this hot multifamily market. Stay away from the "D" properties (the ones in the "warzones" or very rough parts of town)
Good luck! Post further questions and your progress on this forum.