diff --git a/city_model_structure/city.py b/city_model_structure/city.py
index 2d9b55f1..37543115 100644
--- a/city_model_structure/city.py
+++ b/city_model_structure/city.py
@@ -134,27 +134,6 @@ class City:
     """
     return self._buildings
 
-  @property
-  def trees(self) -> NotImplementedError:
-    """
-    raises not implemented error
-    """
-    raise NotImplementedError
-
-  @property
-  def bixi_features(self) -> NotImplementedError:
-    """
-    raises not implemented error
-    """
-    raise NotImplementedError
-
-  @property
-  def composting_plants(self) -> NotImplementedError:
-    """
-    raises not implemented error
-    """
-    raise NotImplementedError
-
   @property
   def lower_corner(self) -> List[float]:
     """