The down payment to acquire this sub to is $25,000. so you give them $25k, you take over a $70k mortgage and they are going to pay $165k in a few years - if you will not do this deal send it to me I will do it. 

@Drew Sygit, Last November Fannie Mae began accepting 5% down payments for owner-occupied 2-, 3-, and 4-unit homes.

Living in one unit and renting out the other helps you scale quickly because you need a lower down payment for a primary residence. 

As with any insurance you need to weigh the cost of doing the repair yourself vs the cost of the premium payments.

We chose these properties for cash flow opportunity and because they work nicely for house hacking because the unit you are occupying is a percentage of a smaller mortgage payment.  

Establish a Charitable Remainder Trust (CRT): By placing the property into a CRT, you can receive a charitable deduction, defer capital gains taxes, and receive income from the trust.

I plotted the range of down payment vs CoC and it's pretty obvious, the less you put down the better your CoC is. 

Also that will give me a lower payment which will allow me to have bigger profit from rent.

I would probably structure it as debt like a loan and possibly break it up into quarterly payments or whatever you think will work best for you as far as repayment. you can get creative....

I found the most difficult part starting out is building a team (agents, lenders, contractors etc.) that you can trust has been the most difficult part.