Defenses or claims based in equity have long been recognized by Pennsylvania courts in zoning and other land use matters. There are three main equitable theories, all of which bar a municipality from enforcing its land use regulations and permit property owners to continue a use or activity in violation of applicable ordinances—equitable estoppel, vested rights and variance by estoppel. Pennsylvania courts consider all three theories unusual remedies that should only be granted in the most extraordinary of circumstances, as in Lamar Advantage GP v. Zoning Hearing Board of Adjustment, 997 A.2d 423 (Pa. Commw. Ct. 2010). These three theories are closely related and the elements of each vary only subtly.

Equitable Estoppel

The doctrine of equitable estoppel applies when:

  • The municipality intentionally or negligently misrepresented a material fact;
  • The municipality knew or had reason to know that the property owner would justifiably rely on the misrepresentation; and
  • The misrepresentation induced the property owner to act to his detriment because of his justifiable reliance, as in Cicchiello v. Bloomsburg Zoning Hearing Board, 617 A.2d 835, 837 (1992).

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