Another thing, If I am buying a turn key property, that means when turnkey company bought that property, they for sure already make sure there are no any liens on it, is that correct assumption?

My assumption is that the owners are renting the home to tenants.

And only then chose a strategy with these assumptions in mind.

Even new properties, though usually don't need repairs early on, things are not built like they used to be and we cannot afford to make the assumption that new means high quality or long term durability. 

If you don't spell it out, the assumption is you are taking responsibility.

I wouldn't make that assumption, at all.

I prepared a spreadsheet with an assumptions tab but there are so many variables, my head is spinning.

The loan assumption on a good DST would be able to accommodate this nicely. 

That could affect how difficult it is to fill the unit during that time of the year, and in turn your vacancy assumptions.

Especially with an outlook to add a lot of value in targeting the right kinds of assets, you might check that assumption (that returns aren't to your liking).Other than that, I don't really know what to tell you.