adding new city_objects

city_model_structure/tree.py

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+  @property
+  def height(self):
+    """
+    Get height of tree
+    :return: height
+    """
+    return self._height
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+
+  @property
+  def canopy(self):
+    """
+    Get canopy of tree
+    :return: canopy
+    """
+    return self._canopy
+