How does your right to enjoy your property deprive him of his right to enjoy his?
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We had a tiny beach house that I put up a small fence on the side of the house for my dogs. The neighbor across the street went nuts, because I blocked some of his view.
He tried to get the city to make me take it down, even though it was permitted.
He sued me for lost of value to his property.
The judge ruling was basically... If he wants a view, let him pay for it.
You are not guaranteed an ocean view when you by a house across the street from the ocean.
If this couple builds their ‘tree house’ on the beach that blocks my view of the ocean that impacts my ability to watch the ocean and decrease the chance that I can sell my beach front property for a profit.
Then I would suggest that you made a bad investment in buying a piece of property that could potentially be blocked if another property owner decided to build on HIS property.
It is not your neighbor's job to make sure your property increases in value, or even holds its value ... especially if doing so comes at the cost of his own.