I used to do junk removal and demolition for these kinds of companies and saw all the worst case scenarios in columbus from tenants that can pay $800 per month. check the vetting requirements, raise the price to get into your unit. 900 per month is cheap in columbus if you are buying c class make sure to take a little more like 2 months rent so the people moving in aren't scraping by

This includes keeping detailed records of all transactions.Mortgage Payments:Handling Income: The LLC can pay the rent for the use of the rental space, which I can then use to help pay off the mortgage.

Aside from the fact that I control my money and don’t pay fees for using it - I also avoid UDFI tax which is triggered by UBIT in syndicated deals.  

Is it a “bad” decision to put 20% down on this multiplex, likely have most of the mortgage covered by the rental income while continuing to pay rent at my current apartment? 

Someone agreed to pay and not only didn't but refused to leave a property they are not paying for so yea I guess your right that is fraud in my opinion. 

I would pay the 2500 but I dont trust the seller to get the place to pass.

I also had non-paying tenants that owed me, HVAC unit needing replacement, large trees hanging over property structure that suddenly died due to beatle infestation and college tuition due all at the same time.  

You won't cash flow in most places while you're house hacking but the goal should be to pay less than you would renting. 

This means instead of getting a mortgage from the bank, you pay the seller in installments.

You also could look at a line of credit on the property and pay interest on the money as you use it.