diff --git a/src/lib/bind/accessors.html b/src/lib/bind/accessors.html
index 66175deae6..9d5033abd2 100644
--- a/src/lib/bind/accessors.html
+++ b/src/lib/bind/accessors.html
@@ -23,7 +23,7 @@
       _notifyChange: function(source, event, value) {
         value = value === undefined ? this[source] : value;
         event = event || Polymer.CaseMap.camelToDashCase(source) + '-changed';
-        this.fire(event, {value: value}, 
+        this.fire(event, {value: value},
           {bubbles: false, cancelable: false, _useCache: true});
       },
 
@@ -221,10 +221,10 @@
         } else {
           // TODO(sorvell): even though we have a `value` argument, we *must*
           // lookup the current value of the property. Multiple listeners and
-          // queued events during configuration can theoretically lead to 
-          // divergence of the passed value from the current value, but we 
+          // queued events during configuration can theoretically lead to
+          // divergence of the passed value from the current value, but we
           // really need to track down a specific case where this happens.
-          value = target[property];
+          value = target.__data__ ? target.__data__[property] : target[property];
           if (!isStructured) {
             this[path] = value;
           } else {
diff --git a/src/lib/template/templatizer.html b/src/lib/template/templatizer.html
index b76fcc463a..6640920c64 100644
--- a/src/lib/template/templatizer.html
+++ b/src/lib/template/templatizer.html
@@ -229,17 +229,12 @@
           for (prop in this._instanceProps) {
             delete parentProps[prop];
           }
-          proto = archetype._parentPropProto = Object.create(null);
-          if (template != this) {
-            // Assumption: if `this` isn't the template being templatized,
-            // assume that the template is not a Poylmer.Base, so prep it
-            // for binding
-            Polymer.Bind.prepareModel(proto);
-            Polymer.Base.prepareModelNotifyPath(proto);
-          }
           // Create accessors for each parent prop that forward the property
           // to template instances through abstract _forwardParentProp API
           // that should be implemented by Templatizer users
+          var propertyEffects = this.mixin({}, this._propertyEffects);
+          var propertyInfo = this.mixin({}, this._propertyInfo);
+          var prefixedParentProps = {};
           for (prop in parentProps) {
             var parentProp = this._parentPropPrefix + prop;
             // TODO(sorvell): remove reference Bind library functions here.
@@ -254,13 +249,22 @@
               effect: {event:
                 Polymer.CaseMap.camelToDashCase(parentProp) + '-changed'}
             }];
-            Polymer.Bind._createAccessors(proto, parentProp, effects);
+            propertyEffects[parentProp] = effects;
+            propertyInfo[parentProp] = {};
+            prefixedParentProps[parentProp] = true;
           }
+          proto = archetype._parentPropProto = {
+            _propertyEffects: propertyEffects,
+            _propertyInfo: propertyInfo,
+            prefixedParentProps: prefixedParentProps
+          };
         }
         // capture this reference for use below
         var self = this;
         // Instance setup
         if (template != this) {
+          Polymer.Bind.prepareModel(template);
+          Polymer.Base.prepareModelNotifyPath(template);
           Polymer.Bind.prepareInstance(template);
           template._forwardParentProp = function(source, value) {
             self._forwardParentProp(source, value);
@@ -282,7 +286,7 @@
     _createHostPropEffector: function(prop) {
       var prefix = this._parentPropPrefix;
       return function(source, value) {
-        this.dataHost._templatized[prefix + prop] = value;
+        this.dataHost._templatized.__setProperty(prefix + prop, value);
       };
     },
 
@@ -294,17 +298,14 @@
       };
     },
 
-    // Similar to Polymer.Base.extend, but retains any previously set instance
-    // values (_propertySetter back on instance once accessor is installed)
+    // Extends template with parent property info & effects and seed pre-bound data
     _extendTemplate: function(template, proto) {
-      var n$ = Object.getOwnPropertyNames(proto);
-      for (var i=0, n; (i<n$.length) && (n=n$[i]); i++) {
-        var val = template[n];
-        var pd = Object.getOwnPropertyDescriptor(proto, n);
-        Object.defineProperty(template, n, pd);
-        if (val !== undefined) {
-          template._propertySetter(n, val);
-        }
+      template._propertyEffects = proto._propertyEffects;
+      template._propertyInfo = proto._propertyInfo;
+      var prefixedParentProps = proto.prefixedParentProps;
+      for (var p in prefixedParentProps) {
+        var val = template[p];
+        template.__data__[p] = val;
       }
     },
 
@@ -323,7 +324,7 @@
       // Call extension point for Templatizer sub-classes
       dataHost._forwardInstancePath.call(dataHost, this, path, value);
       if (root in dataHost._parentProps) {
-        dataHost._templatized.notifyPath(dataHost._parentPropPrefix + path, value);
+        dataHost._templatized._notifyPath(dataHost._parentPropPrefix + path, value);
       }
     },
 
@@ -416,7 +417,7 @@
       if (this._parentProps) {
         var templatized = this._templatized;
         for (var prop in this._parentProps) {
-          model[prop] = templatized[this._parentPropPrefix + prop];
+          model[prop] = templatized.__data__[this._parentPropPrefix + prop];
         }
       }
       return new this.ctor(model, this);