diff --git a/hub/city_model_structure/building.py b/hub/city_model_structure/building.py
index 296182f1..d5129142 100644
--- a/hub/city_model_structure/building.py
+++ b/hub/city_model_structure/building.py
@@ -6,8 +6,10 @@ Project Coder Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
 Code contributors: Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
 """
 
+import sys
 from typing import List, Union
 import numpy as np
+from hub.hub_logger import logger
 import hub.helpers.constants as cte
 from hub.city_model_structure.building_demand.surface import Surface
 from hub.city_model_structure.city_object import CityObject
@@ -46,20 +48,31 @@ class Building(CityObject):
     self._roofs = []
     self._walls = []
     self._internal_walls = []
+    self._ground_walls = []
+    self._attic_floors = []
+    self._interior_slabs = []
     for surface_id, surface in enumerate(self.surfaces):
       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])
       surface.id = surface_id
-      # todo: consider all type of surfaces, not only these four
       if surface.type == cte.GROUND:
         self._grounds.append(surface)
       elif surface.type == cte.WALL:
         self._walls.append(surface)
       elif surface.type == cte.ROOF:
         self._roofs.append(surface)
-      else:
+      elif surface.type == cte.INTERIOR_WALL:
         self._internal_walls.append(surface)
+      elif surface.type == cte.GROUND_WALL:
+        self._ground_walls.append(surface)
+      elif surface.type == cte.ATTIC_FLOOR:
+        self._attic_floors.append(surface)
+      elif surface.type == cte.INTERIOR_SLAB:
+        self._interior_slabs.append(surface)
+      else:
+        logger.error(f'Building {self.name} [alias {self.alias}]  has an unexpected surface type {surface.type}.\n')
+        sys.stderr.write(f'Building {self.name} [alias {self.alias}]  has an unexpected surface type {surface.type}.\n')
 
   @property
   def shell(self) -> Polyhedron:
diff --git a/hub/city_model_structure/building_demand/occupancy.py b/hub/city_model_structure/building_demand/occupancy.py
index 99e4ab23..46d34aa1 100644
--- a/hub/city_model_structure/building_demand/occupancy.py
+++ b/hub/city_model_structure/building_demand/occupancy.py
@@ -6,7 +6,6 @@ Project Coder Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
 """
 from typing import Union, List
 from hub.city_model_structure.attributes.schedule import Schedule
-from hub.city_model_structure.building_demand.occupant import Occupant
 
 
 class Occupancy:
@@ -106,19 +105,3 @@ class Occupancy:
     :param value: [Schedule]
     """
     self._occupancy_schedules = value
-
-  @property
-  def occupants(self) -> Union[None, List[Occupant]]:
-    """
-    Get list of occupants
-    :return: None or List of Occupant
-    """
-    return self._occupants
-
-  @occupants.setter
-  def occupants(self, value):
-    """
-    Set list of occupants
-    :param value: [Occupant]
-    """
-    self._occupants = value
diff --git a/hub/city_model_structure/building_demand/occupant.py b/hub/city_model_structure/building_demand/occupant.py
deleted file mode 100644
index a5916d80..00000000
--- a/hub/city_model_structure/building_demand/occupant.py
+++ /dev/null
@@ -1,145 +0,0 @@
-"""
-Occupant module
-SPDX - License - Identifier: LGPL - 3.0 - or -later
-Copyright © 2022 Concordia CERC group
-Project Coder Sanam Dabirian sanam.dabirian@mail.concordia.ca
-Code contributors: Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
-"""
-
-
-class Occupant:
-  """
-  Occupant class
-  """
-
-  def __init__(self):
-    """
-    Constructor
-    """
-
-    self._heat_dissipation = None
-    self._occupancy_rate = None
-    self._occupant_type = None
-    self._arrival_time = None
-    self._departure_time = None
-    self._break_time = None
-    self._day_of_week = None
-    self._pd_of_meetings_duration = None
-
-  @property
-  def heat_dissipation(self):
-    """
-    Get heat dissipation of occupants in W/person
-    :return: float
-    """
-    return self._heat_dissipation
-
-  @heat_dissipation.setter
-  def heat_dissipation(self, value):
-    """
-    Set heat dissipation of occupants in W/person
-    :param value: float
-    """
-    self._heat_dissipation = float(value)
-
-  @property
-  def occupancy_rate(self):
-    """
-    Get rate of schedules
-    :return: float
-    """
-    return self._occupancy_rate
-
-  @occupancy_rate.setter
-  def occupancy_rate(self, value):
-    """
-    Set rate of schedules
-    :param value: float
-    """
-    self._occupancy_rate = float(value)
-
-  @property
-  def occupant_type(self):
-    """
-    Get type of schedules
-    :return: str
-    """
-    return self._occupant_type
-
-  @occupant_type.setter
-  def occupant_type(self, value):
-    """
-    Set type of schedules
-    :param value: float
-    """
-    self._occupant_type = float(value)
-
-  @property
-  def arrival_time(self):
-    """
-    Get the arrival time of the occupant (for office building) in UTC with format YYYYMMDD HH:mm:ss
-    :return: time
-    """
-    return self._arrival_time
-
-  @arrival_time.setter
-  def arrival_time(self, value):
-    """
-    Set the arrival time of the occupant (for office building) in UTC with format YYYYMMDD HH:mm:ss
-    :param value: time
-    """
-    self._arrival_time = value
-
-  @property
-  def departure_time(self):
-    """
-    Get the departure time of the occupant (for office building) in UTC with format YYYYMMDD HH:mm:ss
-    :return: time
-    """
-    return self._departure_time
-
-  @departure_time.setter
-  def departure_time(self, value):
-    """
-    Set the departure time of the occupant (for office building) in UTC with format YYYYMMDD HH:mm:ss
-    :param value: str
-    """
-    self._departure_time = value
-
-  @property
-  def break_time(self):
-    """
-    Get the lunch or break time of the occupant (for office building) in UTC with format ????
-    :return: break time
-    """
-    # todo @Sanam: define this format, is it the starting time? is it a list with both, starting and ending time?
-    return self._break_time
-
-  @property
-  def day_of_week(self):
-    """
-    Get the day of the week (MON, TUE, WED, THU, FRI, SAT, SUN)
-    :return: str
-    """
-    # todo @Sanam: is this a property or should it be a function
-    #  to get the day of the week of an specific day of the year?
-    return self._day_of_week
-
-  @property
-  def pd_of_meetings_duration(self):
-    """
-    Get the probability distribution of the meeting duration
-    :return: ??
-    """
-    # todo @Sanam: what format are you expecting here??
-    return self._pd_of_meetings_duration
-
-  @pd_of_meetings_duration.setter
-  def pd_of_meetings_duration(self, value):
-    """
-    Get the probability distribution of the meeting duration
-    :param value: ??
-    :return:
-    """
-    # todo @Sanam: what format are you expecting here??
-    self._pd_of_meetings_duration = value
diff --git a/hub/city_model_structure/building_demand/surface.py b/hub/city_model_structure/building_demand/surface.py
index 1c4e4cac..dc392160 100644
--- a/hub/city_model_structure/building_demand/surface.py
+++ b/hub/city_model_structure/building_demand/surface.py
@@ -72,14 +72,6 @@ class Surface:
     if value is not None:
       self._id = str(value)
 
-  # todo: implement share surfaces
-  @property
-  def share_surfaces(self):
-    """
-    Raises not implemented error
-    """
-    raise NotImplementedError
-
   def _max_coord(self, axis):
     if axis == 'x':
       axis = 0
@@ -163,11 +155,11 @@ class Surface:
   @property
   def type(self):
     """
-    Get surface type Ground, Wall or Roof
+    Get surface type Ground, Ground wall, Wall, Attic floor, Interior slab, Interior wall, Roof or Virtual internal
+    If the geometrical LoD is lower than 4,
+    the surfaces' types are not defined in the importer and can only be Ground, Wall or Roof
     :return: str
     """
-
-    # todo: there are more types: internal wall, internal floor... this method must be redefined
     if self._type is None:
       grad = np.rad2deg(self.inclination)
       if grad >= 170:
@@ -304,7 +296,7 @@ class Surface:
     :return: Surface, Surface, Any
     """
     # todo: check return types
-    # todo: recheck this method for LoD3 (windows)
+    #  recheck this method for LoD3 (windows)
     origin = Point([0, 0, z])
     normal = np.array([0, 0, 1])
     plane = Plane(normal=normal, origin=origin)
diff --git a/hub/city_model_structure/city.py b/hub/city_model_structure/city.py
index ef8ebbd1..be5d954f 100644
--- a/hub/city_model_structure/city.py
+++ b/hub/city_model_structure/city.py
@@ -23,7 +23,6 @@ from hub.city_model_structure.iot.station import Station
 from hub.city_model_structure.level_of_detail import LevelOfDetail
 from hub.city_model_structure.machine import Machine
 from hub.city_model_structure.parts_consisting_building import PartsConsistingBuilding
-from hub.city_model_structure.subway_entrance import SubwayEntrance
 from hub.helpers.geometry_helper import GeometryHelper
 from hub.helpers.location import Location
 from hub.city_model_structure.energy_system import EnergySystem
@@ -40,9 +39,7 @@ class City:
     self._lower_corner = lower_corner
     self._upper_corner = upper_corner
     self._buildings = None
-    self._subway_entrances = None
     self._srs_name = srs_name
-    # todo: right now extracted at city level, in the future should be extracted also at building level if exist
     self._location = None
     self._country_code = None
     self._climate_reference_city = None
@@ -163,9 +160,6 @@ class City:
       if self.buildings is not None:
         for building in self.buildings:
           self._city_objects.append(building)
-      if self.subway_entrances is not None:
-        for subway_entrance in self.subway_entrances:
-          self._city_objects.append(subway_entrance)
       if self.energy_systems is not None:
         for energy_system in self.energy_systems:
           self._city_objects.append(energy_system)
@@ -179,14 +173,6 @@ class City:
     """
     return self._buildings
 
-  @property
-  def subway_entrances(self) -> Union[List[SubwayEntrance], None]:
-    """
-    Get the subway entrances belonging to the city
-    :return: a list of subway entrances objects or none
-    """
-    return self._subway_entrances
-
   @property
   def lower_corner(self) -> List[float]:
     """
@@ -224,10 +210,6 @@ class City:
       if self._buildings is None:
         self._buildings = []
       self._buildings.append(new_city_object)
-    elif new_city_object.type == 'subway_entrance':
-      if self._subway_entrances is None:
-        self._subway_entrances = []
-      self._subway_entrances.append(new_city_object)
     elif new_city_object.type == 'energy_system':
       if self._energy_systems is None:
         self._energy_systems = []
diff --git a/hub/city_model_structure/subway_entrance.py b/hub/city_model_structure/subway_entrance.py
deleted file mode 100644
index cd0c8598..00000000
--- a/hub/city_model_structure/subway_entrance.py
+++ /dev/null
@@ -1,45 +0,0 @@
-"""
-Subway entrance module
-SPDX - License - Identifier: LGPL - 3.0 - or -later
-Copyright © 2022 Concordia CERC group
-Project Coder Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
-"""
-from hub.city_model_structure.city_object import CityObject
-
-
-class SubwayEntrance(CityObject):
-  """
-  SubwayEntrance(CityObject) class
-  """
-  def __init__(self, name, latitude, longitude):
-    super().__init__(name, 0)
-    self._name = name
-    self._latitude = latitude
-    self._longitude = longitude
-    self._type = 'subway_entrance'
-
-  @property
-  def latitude(self):
-    # todo: to be defined the spacial point and the units
-    """
-    Get latitude
-    :return: float
-    """
-    return self._latitude
-
-  @property
-  def longitude(self):
-    # todo: to be defined the spacial point and the units
-    """
-    Get longitude
-    :return: float
-    """
-    return self._longitude
-
-  @property
-  def name(self):
-    """
-    Get name
-    :return: str
-    """
-    return self._name
diff --git a/hub/helpers/monthly_to_hourly_demand.py b/hub/helpers/monthly_to_hourly_demand.py
deleted file mode 100644
index a83b9673..00000000
--- a/hub/helpers/monthly_to_hourly_demand.py
+++ /dev/null
@@ -1,138 +0,0 @@
-"""
-monthly_to_hourly_demand module
-SPDX - License - Identifier: LGPL - 3.0 - or -later
-Copyright © 2022 Concordia CERC group
-Project Coder Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
-"""
-import calendar as cal
-import pandas as pd
-from hub.city_model_structure.building_demand.occupant import Occupant
-import hub.helpers.constants as cte
-
-
-class MonthlyToHourlyDemand:
-  """
-  MonthlyToHourlyDemand class
-  """
-  def __init__(self, building, conditioning_seasons):
-    self._hourly_heating = pd.DataFrame()
-    self._hourly_cooling = pd.DataFrame()
-    self._building = building
-    self._conditioning_seasons = conditioning_seasons
-
-  def hourly_heating(self, key):
-    """
-    hourly distribution of the monthly heating of a building
-    :param key: string
-    :return: [hourly_heating]
-    """
-    # todo: this method and the insel model have to be reviewed for more than one thermal zone
-    external_temp = self._building.external_temperature[cte.HOUR]
-    # todo: review index depending on how the schedules are defined, either 8760 or 24 hours
-    for usage in self._building.usages:
-      temp_set = float(usage.heating_setpoint)-3
-      temp_back = float(usage.heating_setback)-3
-      # todo: if these are data frames, then they should be called as (Occupancy should be in low case):
-      # usage.schedules.Occupancy
-      # self._conditioning_seasons.heating
-      occupancy = Occupant().get_complete_year_schedule(usage.schedules['Occupancy'])
-      heating_schedule = self._conditioning_seasons['heating']
-
-      hourly_heating = []
-      i = 0
-      j = 0
-      temp_grad_day = []
-      for month in range(1, 13):
-        temp_grad_month = 0
-        month_range = cal.monthrange(2015, month)[1]
-        for _ in range(1, month_range+1):
-          external_temp_med = 0
-          for hour in range(0, 24):
-            external_temp_med += external_temp[key][i]/24
-          for hour in range(0, 24):
-            if external_temp_med < temp_set and heating_schedule[month-1] == 1:
-              if occupancy[hour] > 0:
-                hdd = temp_set - external_temp[key][i]
-                if hdd < 0:
-                  hdd = 0
-                temp_grad_day.append(hdd)
-              else:
-                hdd = temp_back - external_temp[key][i]
-                if hdd < 0:
-                  hdd = 0
-                temp_grad_day.append(hdd)
-            else:
-              temp_grad_day.append(0)
-
-            temp_grad_month += temp_grad_day[i]
-            i += 1
-
-        for _ in range(1, month_range + 1):
-          for hour in range(0, 24):
-            monthly_demand = self._building.heating[cte.MONTH][month-1]
-            if monthly_demand == 'NaN':
-              monthly_demand = 0
-            if temp_grad_month == 0:
-              hourly_demand = 0
-            else:
-              hourly_demand = float(monthly_demand)*float(temp_grad_day[j])/float(temp_grad_month)
-            hourly_heating.append(hourly_demand)
-            j += 1
-      self._hourly_heating = pd.DataFrame(data=hourly_heating, columns=['monthly to hourly'])
-    return self._hourly_heating
-
-  def hourly_cooling(self, key):
-    """
-    hourly distribution of the monthly cooling of a building
-    :param key: string
-    :return: [hourly_cooling]
-    """
-    # todo: this method and the insel model have to be reviewed for more than one thermal zone
-    external_temp = self._building.external_temperature[cte.HOUR]
-    # todo: review index depending on how the schedules are defined, either 8760 or 24 hours
-    for usage in self._building.usages:
-      temp_set = float(usage.cooling_setpoint)
-      temp_back = 100
-      occupancy = Occupant().get_complete_year_schedule(usage.schedules['Occupancy'])
-      cooling_schedule = self._conditioning_seasons['cooling']
-
-      hourly_cooling = []
-      i = 0
-      j = 0
-      temp_grad_day = []
-      for month in range(1, 13):
-        temp_grad_month = 0
-        month_range = cal.monthrange(2015, month)[1]
-        for _ in range(1, month_range[1] + 1):
-          for hour in range(0, 24):
-            if external_temp[key][i] > temp_set and cooling_schedule[month - 1] == 1:
-              if occupancy[hour] > 0:
-                cdd = external_temp[key][i] - temp_set
-                if cdd < 0:
-                  cdd = 0
-                temp_grad_day.append(cdd)
-              else:
-                cdd = external_temp[key][i] - temp_back
-                if cdd < 0:
-                  cdd = 0
-                temp_grad_day.append(cdd)
-            else:
-              temp_grad_day.append(0)
-
-            temp_grad_month += temp_grad_day[i]
-            i += 1
-
-        for _ in range(1, month_range[1] + 1):
-          for hour in range(0, 24):
-            #            monthly_demand = self._building.heating[cte.MONTH]['INSEL'][month-1]
-            monthly_demand = self._building.cooling[cte.MONTH][month - 1]
-            if monthly_demand == 'NaN':
-              monthly_demand = 0
-            if temp_grad_month == 0:
-              hourly_demand = 0
-            else:
-              hourly_demand = float(monthly_demand) * float(temp_grad_day[j]) / float(temp_grad_month)
-            hourly_cooling.append(hourly_demand)
-            j += 1
-      self._hourly_cooling = pd.DataFrame(data=hourly_cooling, columns=['monthly to hourly'])
-    return self._hourly_cooling
diff --git a/hub/imports/geometry/osm_subway.py b/hub/imports/geometry/osm_subway.py
deleted file mode 100644
index 8e0bd27b..00000000
--- a/hub/imports/geometry/osm_subway.py
+++ /dev/null
@@ -1,58 +0,0 @@
-"""
-OsmSubway module parses osm files and import the metro location into the city model structure
-SPDX - License - Identifier: LGPL - 3.0 - or -later
-Copyright © 2022 Concordia CERC group
-Project Coder Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
-"""
-
-import sys
-import xmltodict
-from pyproj import Transformer
-from hub.city_model_structure.city import City
-from hub.city_model_structure.subway_entrance import SubwayEntrance
-
-
-class OsmSubway:
-  """
-  Open street map subway
-  """
-  def __init__(self, path):
-    self._city = None
-    self._subway_entrances = []
-    with open(path) as osm:
-      self._osm = xmltodict.parse(osm.read(), force_list='tag')
-      for node in self._osm['osm']['node']:
-        if 'tag' not in node:
-          continue
-        for tag in node['tag']:
-          if '@v' not in tag:
-            continue
-          if tag['@v'] == 'subway_entrance':
-            subway_entrance = SubwayEntrance(node['@id'], node['@lat'], node['@lon'])
-            self._subway_entrances.append(subway_entrance)
-
-  @property
-  def city(self) -> City:
-    """
-    Get a city with subway entrances
-    """
-    transformer = Transformer.from_crs("EPSG:4326", "EPSG:3857")
-    lower_corner = [sys.float_info.max, sys.float_info.max, 0]
-    upper_corner = [sys.float_info.min, sys.float_info.min, 0]
-    x = 0
-    y = 1
-    for subway_entrance in self._subway_entrances:
-      coordinate = transformer.transform(subway_entrance.longitude, subway_entrance.latitude)
-      if coordinate[x] >= upper_corner[x]:
-        upper_corner[x] = coordinate[x]
-      if coordinate[y] >= upper_corner[y]:
-        upper_corner[y] = coordinate[y]
-      if coordinate[x] < lower_corner[x]:
-        lower_corner[x] = coordinate[x]
-      if coordinate[y] < lower_corner[y]:
-        lower_corner[y] = coordinate[y]
-
-    city = City(lower_corner, upper_corner, 'unknown')
-    for subway_entrance in self._subway_entrances:
-      city.add_city_object(subway_entrance)
-    return city