Boiled down it's the idea of owning RE without any of the theoretical "headaches" of owning it - you don't have to come up with all the funds for purchase; you don't have to manage it; you don't have to unclog toilets; ETC.

No, it's not a good idea, but it's possible to do correctly if you don't rush into it.

Idea is I may just sell the property the moment the project and renovation is finished.For context, the ADUs will be 2 2bed 2 bath units, 800 sq ft each, 1,600 sq ft total.

OH, no idea, only ever passed through.  

There are plenty of websites that can give you a good idea of property values in your area.

The idea is the product of an ah-ha moment late Friday afternoon as I was scrambling to put the pieces of this puzzle back together.

Interesting idea, but I suspect that would create more problems than it is worth.Most of the leverage you have with a NNN lease is that you are working with a company, presumably one that makes money. 

We still have no idea.

Zillow is saying the house is worth $90k but recently a tree went through the back end of it and I was hoping to get some information on possible ideas or suggestions on what I should do about the situation.

So, unless the Seller is equally inclined to speculate (including the idea of accepting that same 20% deposit using say, a specific sized bar of gold at today's price), it's no surprise that most Sellers still like "stable currency", right?