diff --git a/src/aki_prj23_transparenzregister/models/company.py b/src/aki_prj23_transparenzregister/models/company.py
index 64b5ce3..49abdcd 100644
--- a/src/aki_prj23_transparenzregister/models/company.py
+++ b/src/aki_prj23_transparenzregister/models/company.py
@@ -31,6 +31,7 @@ class RelationshipRoleEnum(str, MultiValueEnum):
     GESCHAEFTSLEITER = "Geschäftsleiter(in)", "Geschäftsleiter"
     ZWEIGNIEDERLASSUNG = "Zweigniederlassung"
     HAUPTNIEDERLASSUNG = "Hauptniederlassung"
+    CARE_OF = "c/o"
 
 
 class CompanyTypeEnum(str, MultiValueEnum):
diff --git a/src/aki_prj23_transparenzregister/utils/data_extraction/unternehmensregister/transform.py b/src/aki_prj23_transparenzregister/utils/data_extraction/unternehmensregister/transform.py
index 468fdee..82a8028 100644
--- a/src/aki_prj23_transparenzregister/utils/data_extraction/unternehmensregister/transform.py
+++ b/src/aki_prj23_transparenzregister/utils/data_extraction/unternehmensregister/transform.py
@@ -486,6 +486,48 @@ def map_last_update(data: dict) -> str:
     return data["XJustiz_Daten"]["Fachdaten_Register"]["Auszug"]["letzte_Eintragung"]
 
 
+def map_co_relation(data: dict) -> dict:
+    """Search for and map the c/o relation from location.street if possible.
+
+    Args:
+        data (dict): Company dict
+
+    Returns:
+        dict: Modified Company dict
+    """
+    street = data["location"].street
+    if street is None:
+        return data
+    parts = street.split(",")
+    co_company = None
+    co_company_index = None
+    for index, part in enumerate(parts):
+        trimmed_part = part.strip()
+        result = re.findall(r"^c\/o(.*)$", trimmed_part)
+        if len(result) == 1:
+            co_company = result[0].strip()
+            co_company_index = index
+    if co_company_index is not None:
+        del parts[co_company_index]
+        street = "".join(parts).strip()
+        data["location"].street = street
+
+        if co_company is not None and co_company != "":
+            relation = CompanyToCompanyRelationship(
+                RelationshipRoleEnum.CARE_OF,  # type: ignore
+                Location(
+                    data["location"].city,
+                    street,
+                    data["location"].house_number,
+                    data["location"].zip_code,
+                ),
+                CompanyRelationshipEnum.COMPANY,  # type: ignore
+                co_company,
+            )
+            data["relationships"].append(relation)
+    return data
+
+
 def map_unternehmensregister_json(data: dict) -> Company:
     """Processes the Unternehmensregister structured export to a Company by using several helper methods.
 
@@ -516,15 +558,13 @@ def map_unternehmensregister_json(data: dict) -> Company:
             data["XJustiz_Daten"]["Grunddaten"]["Verfahrensdaten"]["Beteiligung"][i]
         )
         result["relationships"].append(people)
+    result = map_co_relation(result)
     return Company(**result)
 
 
 if __name__ == "__main__":
     from loguru import logger
 
-    # transform_xml_to_json(
-    #     "./data/Unternehmensregister/scraping/", "./data/Unternehmensregister/export/"
-    # )
     base_path = "./Jupyter/API-tests/Unternehmensregister/data/Unternehmensregister"
     for file in tqdm(glob.glob1(f"{base_path}/export", "*.json")):
         path = os.path.join(f"{base_path}/export", file)
@@ -544,6 +584,7 @@ if __name__ == "__main__":
                     json.dump(
                         dataclasses.asdict(company), export_file, ensure_ascii=False
                     )
-            except Exception:
+            except Exception as e:
+                logger.error(e)
                 logger.error(f"Error in processing {path}")
                 sys.exit(1)
diff --git a/tests/utils/data_extraction/unternehmensregister/transform_test.py b/tests/utils/data_extraction/unternehmensregister/transform_test.py
index a312572..08f24a7 100644
--- a/tests/utils/data_extraction/unternehmensregister/transform_test.py
+++ b/tests/utils/data_extraction/unternehmensregister/transform_test.py
@@ -709,6 +709,86 @@ def test_map_last_update() -> None:
     assert result == date
 
 
+@pytest.mark.parametrize(
+    ("value", "expected_result"),
+    [
+        (
+            {
+                "location": Location(
+                    "", "c/o Youco24 Business Center, Abc ffda", None, None
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("", "Abc ffda", None, None),
+                "relationships": [
+                    CompanyToCompanyRelationship(
+                        RelationshipRoleEnum.CARE_OF,  # type: ignore
+                        Location("", "Abc ffda", None, None),
+                        CompanyRelationshipEnum.COMPANY,
+                        "Youco24 Business Center",
+                    )
+                ],
+            },
+        ),
+        (
+            {
+                "location": Location(
+                    "Iserlohn", "c/o Youco24 Business Center, Abc Str.", "42", "58644"
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [
+                    CompanyToCompanyRelationship(
+                        RelationshipRoleEnum.CARE_OF,  # type: ignore
+                        Location("Iserlohn", "Abc Str.", "42", "58644"),
+                        CompanyRelationshipEnum.COMPANY,
+                        "Youco24 Business Center",
+                    )
+                ],
+            },
+        ),
+        (
+            {
+                "location": Location(
+                    "Iserlohn", "Abc Str., c/o Youco24 Business Center", "42", "58644"
+                ),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [
+                    CompanyToCompanyRelationship(
+                        RelationshipRoleEnum.CARE_OF,  # type: ignore
+                        Location("Iserlohn", "Abc Str.", "42", "58644"),
+                        CompanyRelationshipEnum.COMPANY,
+                        "Youco24 Business Center",
+                    )
+                ],
+            },
+        ),
+        (
+            {
+                "location": Location("Iserlohn", "Abc Str., c/o", "42", "58644"),
+                "relationships": [],
+            },
+            {
+                "location": Location("Iserlohn", "Abc Str.", "42", "58644"),
+                "relationships": [],
+            },
+        ),
+    ],
+)
+def test_map_co_relation(value: dict, expected_result: dict) -> None:
+    result = transform.map_co_relation(value)
+    assert result == expected_result
+
+
+@patch(
+    "aki_prj23_transparenzregister.utils.data_extraction.unternehmensregister.transform.map_co_relation"
+)
 @patch(
     "aki_prj23_transparenzregister.utils.data_extraction.unternehmensregister.transform.map_company_id"
 )
@@ -746,6 +826,7 @@ def test_map_unternehmensregister_json(  # noqa: PLR0913
     mock_loc_from_beteiligung: Mock,
     mock_map_name_from_beteiligung: Mock,
     mock_map_company_id: Mock,
+    mock_map_co_relation: Mock,
 ) -> None:
     expected_result = Company(
         **{  # type: ignore
@@ -770,6 +851,7 @@ def test_map_unternehmensregister_json(  # noqa: PLR0913
     mock_map_business_purpose.return_value = expected_result.business_purpose
     mock_map_founding_date.return_value = expected_result.founding_date
     mock_map_parse_stakeholder.return_value = expected_result.relationships[0]
+    mock_map_co_relation.side_effect = lambda x: x
 
     data: dict = {
         "XJustiz_Daten": {