Artikel 13

Unless otherwise agreed between the States concerned, a State cannot invoke immunity from jurisdiction before a court of another State which is otherwise competent in a proceeding which relates to the determination of:
a) any right or interest of the State in, or its possession or use of, or any obligation of the State arising out of its interest in, or its possession or use of, immovable property situated in the State of the forum;
b) any right or interest of the State in movable or immovable property arising by way of succession, gift or bona vacantia; or
c) any right or interest of the State in the administration of property, such as trust property, the estate of a bankrupt or the property of a company in the event of its winding up.