--- title: "Mannillo v. Gorski" type: Landmark Case source: https://casebriefly.com/landmark-cases/mannillo-v-gorski --- # Mannillo v. Gorski Mannillo v. Gorski addressed the hostility requirement in adverse possession, holding that a mistaken belief of ownership does not defeat a claim of adverse possession. The case also established that minor encroachments may not satisfy the open and notorious requirement unless the true owner had actual knowledge of the encroachment. It is a key case for understanding how courts handle boundary disputes involving innocent encroachments. ## Citation 54 N.J. 378, 255 A.2d 258 (1969) ## Year 1969 ## Court Supreme Court of New Jersey ## Facts The Gorskis made improvements to their property, including adding steps, a concrete walk, and a portion of a stoop that encroached 15 inches onto the Mannillos' adjoining property. The encroachment existed for over 20 years, but the Gorskis sincerely believed the improvements were entirely on their own property. The Mannillos eventually discovered the encroachment and brought an action to have the Gorskis remove the improvements and quiet title. ## Procedural History The trial court found for the Mannillos, holding that the Gorskis' good-faith mistake negated the hostility requirement for adverse possession. The New Jersey Supreme Court reversed and remanded. ## Issue Whether a mistaken belief that an encroachment is on one's own property negates the hostility requirement for adverse possession, and whether a minor encroachment satisfies the open and notorious requirement. ## Holding The court held that a good-faith mistake about the boundary does not negate the hostility requirement — hostility is measured by the objective nature of the possession, not the possessor's subjective intent. However, the court also held that a minor encroachment along a boundary line may not satisfy the open and notorious requirement because it may not be sufficient to put a reasonable owner on notice. The court remanded for a determination of whether the Mannillos had actual knowledge of the encroachment. ## Reasoning Justice Haneman rejected the Maine doctrine (which requires intentional trespass for hostility) in favor of the Connecticut doctrine (which treats any entry and occupation as hostile regardless of subjective intent). The court reasoned that requiring intentional wrongdoing would reward bad-faith possessors at the expense of innocent ones, producing unjust results. On the open and notorious issue, the court recognized that minor boundary encroachments may be so small that a reasonable adjoining landowner would not notice them, thus failing the notice function of the open and notorious requirement. The court provided an equitable alternative: even if adverse possession is established for a minor encroachment, the court may allow the true owner to convey the encroached-upon strip in exchange for payment rather than requiring removal of the encroachment. ## Impact Mannillo v. Gorski has been widely influential in shaping the modern approach to hostility in adverse possession cases involving boundary disputes. Most American jurisdictions now follow the Connecticut doctrine adopted in Mannillo, treating innocent encroachments as hostile. The case's nuanced treatment of the open and notorious requirement for minor encroachments has also been adopted in many jurisdictions. ## Key Quotes - The entry and continued possession by one who believes the land to be his own, and who occupies it as his own in the customary manner, would be hostile. - To permit a holding of title by adverse possession founded on mistake of the true boundary line, the encroachment must be of such character as to put the adjoining landowner on notice. - Where the encroachment of an adjoining landowner is of a minor nature, the doctrine of adverse possession should not be applied to small areas. ## Related Cases - van-valkenburgh-v-lutz - howard-v-kunto - armory-v-delamirie - willard-v-first-church-of-christ-scientist ## Exam Relevance Mannillo v. Gorski is a common exam topic for questions involving boundary disputes, the hostility requirement, and minor encroachments. Students should be prepared to apply the objective (Connecticut) versus subjective (Maine) standards for hostility and to analyze whether a minor encroachment meets the open and notorious requirement. ## Study Tips - Know the three approaches to hostility: (1) objective/Connecticut doctrine (intent irrelevant), (2) good-faith/mistaken belief doctrine, (3) Maine doctrine (aggressive trespass required). - Understand why minor encroachments pose special problems for the open and notorious requirement. - Remember the equitable remedy: courts may require payment for the encroached strip rather than removal of the improvement. - Connect this case to Van Valkenburgh v. Lutz to compare strict versus flexible approaches to hostility. ## Doctrine Established Objective Hostility Standard for Adverse Possession (Connecticut Doctrine) --- Source: [Mannillo v. Gorski — CaseBriefly](https://casebriefly.com/landmark-cases/mannillo-v-gorski)