diff --git a/tests/utils/data_extraction/unternehmensregister/transform_test.py b/tests/utils/data_extraction/unternehmensregister/transform_test.py
index d163184..f6fff63 100644
--- a/tests/utils/data_extraction/unternehmensregister/transform_test.py
+++ b/tests/utils/data_extraction/unternehmensregister/transform_test.py
@@ -731,6 +731,56 @@ def test_map_last_update() -> None:
                 ],
             },
         ),
+        (
+            {
+                "location": Location(
+                    "", "c/o Youco24 Business Center, Abc Str.", "42", "58644"
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [
+                    CompanyToCompanyRelationship(
+                        RelationshipRoleEnum.LOKATION_BEI,  # type: ignore
+                        Location("Iserlohn", "Abc ffda", "42", "58644"),
+                        CompanyRelationshipEnum.COMPANY,
+                        "Youco24 Business Center",
+                    )
+                ],
+            },
+        ),
+        (
+            {
+                "location": Location(
+                    "Iserlohn", "Abc Str. 42, c/o Youco24 Business Center", None, "58644"
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [
+                    CompanyToCompanyRelationship(
+                        RelationshipRoleEnum.LOKATION_BEI,  # type: ignore
+                        Location("Iserlohn", "Abc ffda", "42", "58644"),
+                        CompanyRelationshipEnum.COMPANY,
+                        "Youco24 Business Center",
+                    )
+                ],
+            },
+        ),
+        (
+            {
+                "location": Location(
+                    "Iserlohn", "Abc Str. 42, c/o", None, "58644"
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [],
+            },
+        ),
     ],
 )
 def test_map_co_relation(value: dict, expected_result: dict) -> None: