Соответствующая норма
Practice Relating to Rule 51. Public and Private Property in Occupied Territory
Section B. Immovable public property in occupied territory
Switzerland’s Basic Military Manual (1987) provides: The occupying State shall only be considered as administrator and usufructuary of public buildings, real estate, forests, and agricultural estates belonging to the enemy State, and situated in the occupied territory.” 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 169.