diff --git a/city_model_structure/city.py b/city_model_structure/city.py
index a19e2118..cb87779d 100644
--- a/city_model_structure/city.py
+++ b/city_model_structure/city.py
@@ -23,7 +23,6 @@ class City:
   """
 
   def __init__(self, lower_corner, upper_corner, srs_name, buildings=None):
-    self._buildings = None
     self._name = None
     self._lower_corner = lower_corner
     self._upper_corner = upper_corner
@@ -194,6 +193,7 @@ class City:
     """
     selected_region_lower_corner = [center[0] - radius, center[1] - radius, center[2] - radius]
     selected_region_upper_corner = [center[0] + radius, center[1] + radius, center[2] + radius]
+    # todo, ask @Guille: does this create a new instance of city??
     selected_region_city = City(selected_region_lower_corner, selected_region_upper_corner, srs_name=self.srs_name)
     for city_object in self.city_objects:
       location = city_object.location