diff --git a/city_model_structure/building.py b/city_model_structure/building.py
index c41c9d04..e9722b77 100644
--- a/city_model_structure/building.py
+++ b/city_model_structure/building.py
@@ -24,8 +24,8 @@ class Building(CityObject):
   """
   Building(CityObject) class
   """
-  def __init__(self, name, lod, surfaces, terrains, year_of_construction, function,
-               city_lower_corner, zones_surfaces_ids=[]):
+  def __init__(self, name, lod, surfaces, year_of_construction, function,
+               city_lower_corner, terrains=None, zones_surfaces_ids=[]):
     super().__init__(lod, surfaces, name, city_lower_corner)
     self._basement_heated = None
     self._attic_heated = None
diff --git a/imports/geometry_feeders/obj.py b/imports/geometry_feeders/obj.py
index 31b6b5c0..f5019a6d 100644
--- a/imports/geometry_feeders/obj.py
+++ b/imports/geometry_feeders/obj.py
@@ -70,6 +70,6 @@ class Obj:
           perimeter_polygon = solid_polygon
           surface = Surface(solid_polygon, perimeter_polygon)
           surfaces.append(surface)
-        self._city.add_city_object(Building(name, lod, surfaces, year_of_construction, function,
-                                            self._lower_corner))
+        building = Building(name, lod, surfaces, year_of_construction, function, self._lower_corner)
+        self._city.add_city_object(building)
     return self._city