If you legit spent $10k on HVAC, fridge, etc then it sounds like there may have been some issues that should have been addressed BEFORE this tenant moved in.

When you decide to move out, having multiple units minimizes your risk of the property becoming completely vacant.

I'm not sure if any local lenders will consider the property value once the ADU is complete when reviewing my loan application.

To put someone down like this is completely out of line.  

I can't speak to the licensing issues, but it sounds like overall you had a different experience than me.

Identify actual buyer who is willing/able to pay at least negotiated price, plus finder/transfer fee ($5-10k, for example); create a contract with end-buyer that identifies finder/transfer fee, agreement to complete purchase, and assigns difference (if any) of contract price and end-buyer price to self4.

Completely understandable.  

Sounds like you have a model that is working for you, even in a tough year.

Congratulations on completing the rehab!

Completely remodeled it and held onto for around a year