We finished the lower unit and a lot of external work (over improved).. 

The only way you can make it worth 100K or more is to do some major improvements that will add value or if external factors like a big tech company or massive job growth occurs within the neighborhood to make the area and the house more valuable.

In other words, I don't think there's a straight-forward to calculate your ROI as GP without taking into consideration a number of external factors.Originally posted by @Spencer Gray:@Alina Trigub Thanks for responding.

Externally, I'm working on replacing existing some old cypress bushes with a raised bed garden. 

Now when you have other partners involved, I generally think LLCs are a smart idea not only because it protects against both "external" and "internal" liability.

Does it suffer from functional/external obsolescence?

No roof, no external repairs. 

Yes, there are HOA fees but you don't have to worry about any external maintenance. 

It could be homes that you hand pick based on criteria that you establish (sq ft, bedroom count, etc) that aren't necessarily even in the same area.The process is VERY similar to ACTUAL farming, which is why the terminology is used. 

Additional things to check for are insulation is newer to help reduce the head load from the attic, additionally, depending on the age of the house, external insulation breaks down.