diff --git a/buildings/Facade.py b/buildings/Facade.py
index e542bb1..ea53ae7 100644
--- a/buildings/Facade.py
+++ b/buildings/Facade.py
@@ -1,6 +1,6 @@
 import random as rd
 from utils.Enums import COLLUMN_STYLE
-from gdpc import Editor, Transform
+from gdpc import Editor, Block, geometry, Transform
 from buildings.geometry.Vertice import Vertice
 from buildings.elements.Window import Window
 
@@ -15,11 +15,16 @@ class Facade:
         self.window =  self.get_window()
         self.has_balcony = self.has_balcony()
         self.has_inter_floor = self.has_inter_floor()
+        self.editor, self.materials = None,None
         
-    def build(self, editor : Editor, materials : list[str]):            
+    def build(self, editor : Editor, materials : list[str]):  
+        self.editor = editor
+        self.materials = materials
+                  
         for vertice in self.vertices:
             vertice.fill(editor, materials[0], self.height, xpadding = self.padding, zpadding = self.padding)
             with editor.pushTransform(Transform(vertice.point1.position,rotation = vertice.facing.value)):
+                self.build_inter_floor(vertice)
                 self.window.build(editor, vertice.get_len(), self.height, materials)
         
     def get_window(self) -> Window:
@@ -31,9 +36,13 @@ class Facade:
             
         return Window(self.rdata["windows"] ,max_width, max_height)
     
+    def build_inter_floor(self, vertice : Vertice):
+        if self.has_inter_floor:
+            geometry.placeCuboid(self.editor,(0,self.height,-1),(self.length,self.height,-1),Block(self.materials[4], {"facing": "south", "half": "top"})) 
+    
     def has_balcony(self) -> bool:
-        pass
+        return self.rdata["balcony"] >= rd.random()
     
     def has_inter_floor(self) -> bool:
-        pass
+        return self.rdata["inter_floor"] >= rd.random()
     
\ No newline at end of file
diff --git a/buildings/elements/Balcony.py b/buildings/elements/Balcony.py
new file mode 100644
index 0000000..55691ab
--- /dev/null
+++ b/buildings/elements/Balcony.py
@@ -0,0 +1,4 @@
+class Balcony:
+    def __init__(self, length, width):
+        self.length = length
+        self.width = width
\ No newline at end of file
diff --git a/buildings/elements/Window.py b/buildings/elements/Window.py
index 395cc5c..4d211da 100644
--- a/buildings/elements/Window.py
+++ b/buildings/elements/Window.py
@@ -1,7 +1,8 @@
 import random as rd
 import math
 from gdpc import Editor, Block, geometry, Transform
-from utils.Enums import COLLUMN_STYLE
+from utils.Enums import COLLUMN_STYLE, BORDER_RADIUS
+from utils.functions import *
 from buildings.geometry.Point import Point
 from buildings.geometry.Vertice import Vertice
 
@@ -13,6 +14,7 @@ class Window:
         self.has_multiple_windows = self.has_multiple_windows()
         self.is_alternate = self.is_alternate()
         self.has_vertical_crossbar, self.has_horizontal_crossbar = self.has_crossbars()
+        self.border_radius = self.border_radius()
         self.padding = 0
         self.editor, self.materials = None,None
         
@@ -24,12 +26,12 @@ class Window:
         self.padding = (facade_len - self.width)//2
         self.width = facade_len - self.padding*2
         
-        self.is_alternate = True
         if not self.is_grounded: editor.transform @= Transform((0,(facade_height-self.height)//2,0))
+        editor.transform @= Transform((self.padding,0,0))
         
         if self.has_multiple_windows: self.build_multiple_windows()
         else :
-            self.place_glasses(self.padding, self.width+self.padding)
+            self.place_glasses(0, self.width)
         
     def build_multiple_windows(self):
         slices = rd.randint(3, self.width//self.rdata["size"]["min_width"])
@@ -48,9 +50,8 @@ class Window:
             if i ==  mid: wsize, isize = wsize + remainder, isize + remainder
             
             # kepp a spacing between windows, "is revert" is used to keep symetry
-            if is_window:
-                x=  self.padding + gap               
-                self.place_glasses(x, x+wsize)
+            if is_window:               
+                self.place_glasses(gap, gap+wsize)
                 gap += wsize
             else : 
                 gap += isize
@@ -70,9 +71,10 @@ class Window:
                 is_block = not is_block
             
         else:
-            geometry.placeCuboid(self.editor,(x1,0,0),(x2,self.height,0),Block(self.materials[1]))
+            geometry.placeCuboid(self.editor,(x1,0,0),(x2-1,self.height,0),Block(self.materials[1]))
             
         self.build_crossbars(x1, x2-1, len)
+        if len > 1: self.build_border_radius(x1, x2-1)
         
     def get_size(self, max_width : int ,max_height : int) -> tuple[int,int]:
         return (
@@ -83,29 +85,38 @@ class Window:
     def build_crossbars(self, x1 : int, x2 : int, len : int):
         if self.has_vertical_crossbar and self.height >= self.rdata["crossbars"]["min_height_for_vertical_crossbar"]:
             y = self.height//2
-            geometry.placeCuboid(self.editor,(x1,y,0),(x2,self.height-y,0),Block(self.materials[3]))
+            geometry.placeCuboid(self.editor,(x1,y,0),(x2,y,0),Block(self.materials[3]))
         if self.has_horizontal_crossbar and len >= self.rdata["crossbars"]["min_width_for_horizontal_crossbar"]:
-            pass 
+            x = len//2
+            geometry.placeCuboid(self.editor,(x1+x,0,0),(x2-x,self.height,0),Block(self.materials[3], {"up" : "true"})) 
+            
+    def build_border_radius(self, x1 : int, x2 : int):
+        if self.border_radius != BORDER_RADIUS.NONE:
+            self.editor.placeBlock((x1,self.height,0),Block(self.materials[4], {"facing": "west", "half": "top"}))
+            self.editor.placeBlock((x2,self.height,0),Block(self.materials[4], {"facing": "east", "half": "top"}))
+        if self.border_radius == BORDER_RADIUS.TOP_AND_BOTTOM:
+            self.editor.placeBlock((x1,0,0),Block(self.materials[4], {"facing": "west"}))
+            self.editor.placeBlock((x2,0,0),Block(self.materials[4], {"facing": "east"}))
                           
     def is_grounded(self):
         # if the window is grounded or if there is a padding between the window and the ground
-        if self.rdata["grounded"] >= rd.random(): return True
-        return False
+        return self.rdata["grounded"] >= rd.random()
     
     def has_multiple_windows(self):
         if self.width >  self.rdata["size"]["max_width"]: return True
-        if self.width >=  self.rdata["multiple"]["min_width"]:
-            return True
-            if self.rdata["multiple"]["proba"] >= rd.random(): return True
-        return False
+        elif self.width >=  self.rdata["multiple"]["min_width"]:
+            return self.rdata["multiple"]["proba"] >= rd.random()
+        else : return False
     
     def is_alternate(self):
         # if the window alternate between glass_blocks and glass_panes
-        if self.rdata["alternate"] >= rd.random(): return True
-        return False
+        return self.rdata["alternate"] >= rd.random()
     
     def has_crossbars(self):
         # if the window has crossbars
         data = self.rdata["crossbars"]
         
-        return (data["vertical_crossbar"] >= rd.random(), data["horizontal_crossbar"] >= rd.random())
\ No newline at end of file
+        return (data["vertical_crossbar"] >= rd.random(), data["horizontal_crossbar"] >= rd.random())
+    
+    def border_radius(self):
+        return select_random(self.rdata["border_radius"], BORDER_RADIUS)
\ No newline at end of file
diff --git a/main.py b/main.py
index c6dd711..9dd676e 100644
--- a/main.py
+++ b/main.py
@@ -7,9 +7,11 @@ from buildings.Building import Building
 
 from buildings.geometry.Vertice import Vertice
 from buildings.geometry.Point import Point
-from utils.Enums import DIRECTION,COLLUMN_STYLE
+from utils.Enums import DIRECTION,COLLUMN_STYLE,BORDER_RADIUS
 from buildings.Facade import Facade
 
+from utils.functions import *
+
 editor = Editor(buffering=True)
 
 f = JsonReader('buildings\shapes.json')
@@ -18,20 +20,21 @@ shapes = f.data
 y = YamlReader('params.yml')
 random_data = y.data
 
-transform = Transform((0,-60,0),rotation = 0)
+
+transform = Transform((0,-60,-5),rotation = 0)
 editor.transform.push(transform)
 
-geometry.placeCuboid(editor, (0,-60,-5), (100,-45,-5), Block("air"))
+geometry.placeCuboid(editor, (0,0,-1), (100,15,1), Block("air"))
 
 
 x = 0
 facade = []
 for i in range(3,13):
-    facade.append(Facade(random_data["buildings"]["facade"],[Vertice(Point(x,0,-5), Point(x+i,0,-5), DIRECTION.NORTH)],i,i,COLLUMN_STYLE.NONE))
+    facade.append(Facade(random_data["buildings"]["facade"],[Vertice(Point(x,0,0), Point(x+i,0,0), DIRECTION.NORTH)],i,i,COLLUMN_STYLE.NONE))
     x += i+2
 
 for f in facade:
-    f.build(editor, ["stone_bricks","glass_pane","glass","cobblestone_wall"])
+    f.build(editor, ["stone_bricks","glass_pane","glass","cobblestone_wall","stone_brick_stairs"])
 
  
 # F = Foundations((0,0), (20,20), shapes[0]['matrice'])
diff --git a/params.yml b/params.yml
index c35e466..7cd9afc 100644
--- a/params.yml
+++ b/params.yml
@@ -7,10 +7,10 @@ buildings:
   foudations:
     collumn_style :
     # proportion of each style
-      - none: 1
-      - inner: 1
-      - outer: 1
-      - both: 1
+      none: 1
+      inner: 1
+      outer: 1
+      both: 1
     floor:
       min_height: 4
       max_height: 7
@@ -34,5 +34,10 @@ buildings:
         # min size and probability of multiple windows on the same vertice
         min_width: 5
         proba: 0.5
+      border_radius:
+        # proportion of each style
+        none: 2
+        top: 1
+        top_and_bottom: 1
     inter_floor: 0.5
     balcony: 0.25
\ No newline at end of file
diff --git a/utils/Enums.py b/utils/Enums.py
index 66c55b9..4da1c62 100644
--- a/utils/Enums.py
+++ b/utils/Enums.py
@@ -10,4 +10,9 @@ class COLLUMN_STYLE(Enum):
     NONE = 0
     INNER = 1
     OUTER = 2
-    BOTH = 3
\ No newline at end of file
+    BOTH = 3
+    
+class BORDER_RADIUS(Enum):
+    NONE = 0
+    TOP = 1
+    TOP_AND_BOTTOM = 2
\ No newline at end of file
diff --git a/utils/functions.py b/utils/functions.py
new file mode 100644
index 0000000..aec47f8
--- /dev/null
+++ b/utils/functions.py
@@ -0,0 +1,6 @@
+from enum import Enum
+import random as rd
+
+def select_random(rdata : dict, enum : Enum) -> Enum:
+    # select a random value of the dict according to his coef and return the corresponding value in the enum
+    return enum[rd.choice([elt for elt,num in rdata.items() for _ in range(num)]).upper()]
\ No newline at end of file