diff --git a/hub/city_model_structure/building_demand/thermal_zone.py b/hub/city_model_structure/building_demand/thermal_zone.py
index 60d4907c..f4262aec 100644
--- a/hub/city_model_structure/building_demand/thermal_zone.py
+++ b/hub/city_model_structure/building_demand/thermal_zone.py
@@ -34,7 +34,7 @@ class ThermalZone:
                volume,
                footprint_area,
                number_of_storeys,
-               usage_name=None):
+               usages=None):
     self._id = None
     self._parent_internal_zone = parent_internal_zone
     self._footprint_area = footprint_area
@@ -51,10 +51,6 @@ class ThermalZone:
     self._view_factors_matrix = None
     self._total_floor_area = None
     self._number_of_storeys = number_of_storeys
-    self._usage_name = usage_name
-    self._usage_from_parent = False
-    if usage_name is None:
-      self._usage_from_parent = True
     self._hours_day = None
     self._days_year = None
     self._mechanical_air_change = None
@@ -64,7 +60,8 @@ class ThermalZone:
     self._internal_gains = None
     self._thermal_control = None
     self._domestic_hot_water = None
-    self._usages = None
+    self._usage_name = None
+    self._usages = usages
 
   @property
   def parent_internal_zone(self) -> InternalZone:
@@ -81,20 +78,8 @@ class ThermalZone:
     Eg: 70-office_30-residential
     :return: str
     """
-    if self._usage_from_parent:
+    if self._usages is not None:
       self._usages = copy.deepcopy(self._parent_internal_zone.usages)
-    else:
-      values = self._usage_name.split('_')
-      usages = []
-      for value in values:
-        usages.append(value.split('-'))
-      self._usages = []
-      for parent_usage in self._parent_internal_zone.usages:
-        for value in usages:
-          if parent_usage.name == value[1]:
-            new_usage = copy.deepcopy(parent_usage)
-            new_usage.percentage = float(value[0]) / 100
-            self._usages.append(new_usage)
     return self._usages
 
   @property