집합 건물 공용 부분의 무단 점유 사례에서 부당 이득 반환 청구권의 성립 요건으로서의 손실 내지 손해의 존부가 문제 된 해외 사례를 찾아보기 어렵다.
It is difficult to find any overseas cases in which the existence of loss or damage as a requirement for the establishment of the right to claim for the return of unreasonable gains in the case of unauthorized occupation of the common part of the collective building was a problem.