Artikel 26

Notwithstanding the provisions of Article 23, a judgment rendered against a Contracting State in proceedings relating to an industrial or commercial activity, in which the State is engaged in the same manner as a private person, may be enforced in the State of the forum against property of the State against which judgment has been given, used exclusively in connection with such an activity, if:
(a) both the State of the forum and the State against which the judgment has been given have made declarations under Article 24;
(b) the proceedings which resulted in the judgment fell within Articles 1 to 13 or were instituted in accordance with paragraphs 1 and 2 of Article 24; and
(c) the judgment satisfies the requirements laid down in paragraph (b) of Article 20.