Restatement Second of Torts § 826
Unreasonableness of Intentional Invasion
An intentional invasion of another's interest in the use and enjoyment of land is unreasonable if
- the gravity of the harm outweighs the utility of the actor's conduct, or
- the harm caused by the conduct is serious and the financial burden of compensating for this and similar harm to others would not make the continuation of the conduct not feasible.