So a main house has solar panels and produces about 10-15% over than the needed. 

If the LLC transfer results in more than 50% ownership changing hands, reassessment is likely.

Another option that requires more legwork is to call the servicer/ producer of the inverter.

As a result, I had to move forward with a septic replacement.

This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

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Or try the reverse - rehab a property to Class A standards in a Class D neighborhood and try to get a Class A or B tenant to rent it.Unfortunately, many newbie real estate investors are jumping into buying affordable Class C rentals - expecting Class A results.

Buying the land right (at a good price) will determine the end result of cash flow (if building the home to keep) especially as you factor in Holding costs and Builder fees. 

You didn't buy the house to preserve it, but for it to produce income.

the value added versus cost to add, especially in single family zoned areas, typically results in a large negative initial position.