diff --git a/Packages/vcs/vcs/VCS_validation_functions.py b/Packages/vcs/vcs/VCS_validation_functions.py
index 2968d7832f..271fb17938 100644
--- a/Packages/vcs/vcs/VCS_validation_functions.py
+++ b/Packages/vcs/vcs/VCS_validation_functions.py
@@ -2007,7 +2007,7 @@ def add_level_ext_2(self, ext_value):
         if isinstance(self.levels[0], list):  # remove from tuple of lists
             if self.levels[-1][1] > 9.e19:
                 self.levels.pop(-1)
-        if isinstance(self.levels, tuple):       # remove from list
+        if isinstance(self.levels, (tuple, list)):       # remove from list
             ret_tup = []
             for i in range(len(self.levels) - 1):
                 ret_tup.insert(i + 1, self.levels[i])
@@ -2021,15 +2021,16 @@ def add_level_ext_2(self, ext_value):
         return self.levels
 
     # We may need to add extnsion
-    if isinstance(self.levels, tuple):
-        self.levels = list(self.levels)
-    if isinstance(self.levels[-1], list):  # add to tuple of lists
-        if self.levels[-1][1] < 9.e19:
-            self.levels.append([self.levels[-1][1], 1e20])
-    else:
-        if self.levels[-1] < 9.e19:
-            self.levels.append(1.e20)
-    return self.levels
+    if isinstance(self.levels, (list, tuple)):
+        if isinstance(self.levels, tuple):
+            self.levels = list(self.levels)
+        if isinstance(self.levels[-1], list):  # add to tuple of lists
+            if self.levels[-1][1] < 9.e19:
+                self.levels.append([self.levels[-1][1], 1e20])
+        else:
+            if self.levels[-1] < 9.e19:
+                self.levels.append(1.e20)
+        return self.levels
 
 
 def _getext_1(self):
diff --git a/Packages/vcs/vcs/projection.py b/Packages/vcs/vcs/projection.py
index 6b19c5e62f..cabf461eb5 100644
--- a/Packages/vcs/vcs/projection.py
+++ b/Packages/vcs/vcs/projection.py
@@ -327,6 +327,12 @@ def list(self):
         print 'name =', self.name
         print 'type =', self.type
         # print 'parameters =',self.parameters
+
+        for att in self.attributes:
+            print att, '=', getattr(self, att)
+
+    @property
+    def attributes(self):
         p = []
         if self._type in [3, 4]:
             p.append('smajor')
@@ -455,8 +461,7 @@ def list(self):
             p.append('centerlatitude')
             p.append('falseeasting')
             p.append('falsenorthing')
-        for att in p:
-            print att, '=', getattr(self, att)
+        return p
 
     ##########################################################################
     #                                                                           #
diff --git a/testing/vcs/CMakeLists.txt b/testing/vcs/CMakeLists.txt
index a3b3b155e0..828e88f725 100644
--- a/testing/vcs/CMakeLists.txt
+++ b/testing/vcs/CMakeLists.txt
@@ -30,8 +30,10 @@ foreach(lat_0 45 90)
     ${lat_0}
     )
 endforeach()
-
-
+cdat_add_test(test_vcs_extends
+  "${PYTHON_EXECUTABLE}"
+  ${cdat_SOURCE_DIR}/testing/vcs/test_vcs_extends.py
+)
 cdat_add_test(test_vcs_create_get
   "${PYTHON_EXECUTABLE}"
   ${cdat_SOURCE_DIR}/testing/vcs/test_vcs_create_get.py
diff --git a/testing/vcs/test_vcs_extends.py b/testing/vcs/test_vcs_extends.py
new file mode 100644
index 0000000000..4106cecd64
--- /dev/null
+++ b/testing/vcs/test_vcs_extends.py
@@ -0,0 +1,29 @@
+import vcs
+import numpy
+
+box = vcs.createboxfill()
+
+box.ext_1 = True
+assert numpy.allclose(box.levels, [1e20] * 2)
+
+box.ext_2 = True
+assert numpy.allclose(box.levels, [1e20] * 2)
+
+box.levels = [1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
+assert box.ext_1 == False
+assert box.ext_1 == False
+
+box.ext_1 = True
+assert box.levels[0] < -9e19
+
+box.ext_2 = True
+assert box.levels[-1] > 9e19
+
+box.ext_1 = False
+assert box.levels[0] > -9e19
+
+box.ext_2 = False
+assert box.levels[-1] < 9e19
+
+
+