diff --git a/helix/models/corner.py b/helix/models/corner.py
index 8c55640..24e474f 100644
--- a/helix/models/corner.py
+++ b/helix/models/corner.py
@@ -1,12 +1,13 @@
 
 
 class Corner(object):
-    def __init__(self, x, y, length, angle):
+    def __init__(self, x, y, length_ccw, length_cw, angle):
         self.x = x
         self.y = y
-        self.length = length
+        self.length_ccw = length_ccw
+        self.length_cw = length_cw
         self.angle = angle
 
     @property
     def dictionary(self):
-        return {"x": self.x, "y": self.y, "length": self.length, "angle": self.angle}
+        return {"x": self.x, "y": self.y, "length ccw": self.length_ccw, "length cw : ": self.length_cw, "angle": self.angle}
diff --git a/helix/presenters/panel_presenter.py b/helix/presenters/panel_presenter.py
index 7cee812..81720f0 100644
--- a/helix/presenters/panel_presenter.py
+++ b/helix/presenters/panel_presenter.py
@@ -85,7 +85,8 @@ class ProjectPresenter(object):
                 else:
                     next_corner = building[i+1]
                 
-                corner_length = sqrt((next_corner[0] - corner[0])**2 + (next_corner[1] - corner[1])**2)
+                corner_length_ccw = sqrt((next_corner[0] - corner[0])**2 + (next_corner[1] - corner[1])**2)
+                corner_length_cw = sqrt((previous_corner[0] - corner[0])**2 + (previous_corner[1] - corner[1])**2)
                 k1 = (corner[1] - previous_corner[1]) / (corner[0] - previous_corner[0])
                 k2 = (next_corner[1] - corner[1]) / (next_corner[0] - corner[0])
                 theta2 = degrees(atan(k2))
@@ -100,7 +101,7 @@ class ProjectPresenter(object):
                         theta1 = 180 + theta1
                 
                 corner_angle = theta1
-                presentable_building.append(Corner(corner[0], corner[1], corner_length, corner_angle).__dict__)
+                presentable_building.append(Corner(corner[0], corner[1], corner_length_ccw,corner_length_cw, corner_angle).__dict__)
                 previous_corner = corner
 
         return result