If I'm you neighbor can I build a mother of all walls on my land, blocking out all sunlight from your place. Go right ahead, our house is situated in the middle of our property, 26 acres.
Am I allowed to use my house as a halfway house for the insane ?
Only if you are a mental hospital.
Am I allowed to grow pot on my land ?
Pot is a controlled substance.
Can I as your neighbor, build a oil refinery on my land ?
Go for it, unfortunately it would just be a waste because all the mineral rights in this area were sold or given away 100 years ago.
I still believe and will always believe in 'personal property rights'.
Stating that your house in the middle of 26 acres, that only a mental hospital can open a halfway house for the insane, that pot is a controlled substance, and that the mineral rights were already sold or given away, is a cop out to the questions raised. Three out of those four could in theory change with out any decision on your part. If we bring in the current use of Imminent Domain into the discussion, all four could change. You did not answer the question that was raised.