2nd 10% purchase strategy. Get 2 properties for the same dwn pmt

[Anthony Grandinetti]

So I was viewing a quadplex with my realtor yesterday and the owner brought up the fact that they have another quadplex one block over and my realtor asked him if he would consider doing a second 10% for me so I could pay the same down payment if I wanted to consider purchasing both quads at the same time. I had never heard of this before yesterday. Apparently the seller would maintain a second mortgage and I would have to pay him back over time on top of my mortgage for the other half of my down payment. But this makes sense to me. However I am new to real estate investment so I want to hear what you guys think. Is this a good idea? What’s the downside? besides the obvious of just more debt.