diff --git a/src/MDConcOwnershipStatus.php b/src/MDConcOwnershipStatus.php
index 6ed5a2f..4e7fd95 100644
--- a/src/MDConcOwnershipStatus.php
+++ b/src/MDConcOwnershipStatus.php
@@ -35,6 +35,10 @@ final class MDConcOwnershipStatus implements MDImporterConcordanceListInterface
         "Ensemble soll bei Umzug des Möbeldepots an Senat zurückgegeben werden (Jan. 2009)" => "borrowed",
         "Leihgabe 13.8.96" => "borrowed",
 
+        // Owned by others => third_party_property
+        'Third party property' => 'third_party_property',
+        'Fremdeigentum' => 'third_party_property',
+
     ];
 
     /**