diff --git a/hub/city_model_structure/building.py b/hub/city_model_structure/building.py
index 8d8b5ea3..0f4dbc8b 100644
--- a/hub/city_model_structure/building.py
+++ b/hub/city_model_structure/building.py
@@ -70,6 +70,9 @@ class Building(CityObject):
       self._min_x = min(self._min_x, surface.lower_corner[0])
       self._min_y = min(self._min_y, surface.lower_corner[1])
       self._min_z = min(self._min_z, surface.lower_corner[2])
+      self._max_x = max(self._max_x, surface.upper_corner[0])
+      self._max_y = max(self._max_y, surface.upper_corner[1])
+      self._max_z = max(self._max_z, surface.upper_corner[2])
       surface.id = surface_id
       if surface.type == cte.GROUND:
         self._grounds.append(surface)
diff --git a/hub/city_model_structure/building_demand/surface.py b/hub/city_model_structure/building_demand/surface.py
index 7fbef20d..9f85efb6 100644
--- a/hub/city_model_structure/building_demand/surface.py
+++ b/hub/city_model_structure/building_demand/surface.py
@@ -154,7 +154,6 @@ class Surface:
     if self._inclination is None:
       self._inclination = np.arccos(self.perimeter_polygon.normal[2])
     return self._inclination
-
   @property
   def type(self):
     """