diff --git a/CHANGES.md b/CHANGES.md
index a2dfb123e38c..28b375792f66 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@ Change Log
 
 ##### Breaking Changes :mega:
 * `Resource.fetchImage` now returns an `ImageBitmap` instead of `Image` when supported. This allows for decoding images while fetching using `createImageBitmap` to greatly speed up texture upload and decrease frame drops when loading models with large textures. [#7579](https://github.com/AnalyticalGraphicsInc/cesium/pull/7579)
+* `Cesium3DTileStyle.style` now has an empty `Object` as its default value, instead of `undefined`. [#7567](https://github.com/AnalyticalGraphicsInc/cesium/issues/7567)
 
 ##### Deprecated :hourglass_flowing_sand:
 * `Resource.fetchImage` now takes an options object. Use `resource.fetchImage({ preferBlob: true })` instead of `resource.fetchImage(true)`. The previous function definition will no longer work in 1.57. [#7579](https://github.com/AnalyticalGraphicsInc/cesium/pull/7579)
@@ -13,6 +14,7 @@ Change Log
 * `Resource.fetchImage` now has a `flipY` option to vertically flip an image during fetch & decode. It is only valid when `ImageBitmapOptions` is supported by the browser. [#7579](https://github.com/AnalyticalGraphicsInc/cesium/pull/7579)
 * Added `backFaceCulling` and `normalShading` options to `PointCloudShading`. Both options are only applicable for point clouds containing normals. [#7399](https://github.com/AnalyticalGraphicsInc/cesium/pull/7399)
 * Added support for touch and hold gesture. The touch and hold delay can be customized by updating `ScreenSpaceEventHandler.touchHoldDelayMilliseconds`. [#7286](https://github.com/AnalyticalGraphicsInc/cesium/pull/7286)
+* `Cesium3DTileStyle.style` reacts to updates and represents the current state of the style. [#7567](https://github.com/AnalyticalGraphicsInc/cesium/issues/7567)
 
 ##### Fixes :wrench:
 * Fixed the value for `BlendFunction.ONE_MINUS_CONSTANT_COLOR`. [#7624](https://github.com/AnalyticalGraphicsInc/cesium/pull/7624)
diff --git a/Source/Scene/Cesium3DTileStyle.js b/Source/Scene/Cesium3DTileStyle.js
index f6b2ed67949c..0b3a0fea74be 100644
--- a/Source/Scene/Cesium3DTileStyle.js
+++ b/Source/Scene/Cesium3DTileStyle.js
@@ -56,7 +56,7 @@ define([
      * @see {@link https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification/Styling|3D Tiles Styling language}
      */
     function Cesium3DTileStyle(style) {
-        this._style = undefined;
+        this._style = {};
         this._ready = false;
 
         this._show = undefined;
@@ -112,9 +112,8 @@ define([
     }
 
     function setup(that, styleJson) {
-        that._style = clone(styleJson, true);
-
-        styleJson = defaultValue(styleJson, defaultValue.EMPTY_OBJECT);
+        styleJson = defaultValue(clone(styleJson, true), that._style);
+        that._style = styleJson;
 
         that.show = styleJson.show;
         that.color = styleJson.color;
@@ -161,6 +160,7 @@ define([
 
     function getExpression(tileStyle, value) {
         var defines = defaultValue(tileStyle._style, defaultValue.EMPTY_OBJECT).defines;
+
         if (!defined(value)) {
             return undefined;
         } else if (typeof value === 'boolean' || typeof value === 'number') {
@@ -173,6 +173,17 @@ define([
         return value;
     }
 
+    function getJsonFromExpression(expression) {
+        if (!defined(expression)) {
+            return undefined;
+        } else if (defined(expression.expression)) {
+            return expression.expression;
+        } else if (defined(expression.conditionsExpression)) {
+            return clone(expression.conditionsExpression, true);
+        }
+        return expression;
+    }
+
     defineProperties(Cesium3DTileStyle.prototype, {
         /**
          * Gets the object defining the style using the
@@ -183,7 +194,7 @@ define([
          * @type {Object}
          * @readonly
          *
-         * @default undefined
+         * @default {}
          *
          * @exception {DeveloperError} The style is not loaded.  Use Cesium3DTileStyle.readyPromise or wait for Cesium3DTileStyle.ready to be true.
          */
@@ -295,6 +306,7 @@ define([
             },
             set : function(value) {
                 this._show = getExpression(this, value);
+                this._style.show = getJsonFromExpression(this._show);
                 this._showShaderFunctionReady = false;
             }
         },
@@ -357,6 +369,7 @@ define([
             },
             set : function(value) {
                 this._color = getExpression(this, value);
+                this._style.color = getJsonFromExpression(this._color);
                 this._colorShaderFunctionReady = false;
             }
         },
@@ -424,6 +437,7 @@ define([
             },
             set : function(value) {
                 this._pointSize = getExpression(this, value);
+                this._style.pointSize = getJsonFromExpression(this._pointSize);
                 this._pointSizeShaderFunctionReady = false;
             }
         },
@@ -473,6 +487,7 @@ define([
             },
             set : function(value) {
                 this._pointOutlineColor = getExpression(this, value);
+                this._style.pointOutlineColor = getJsonFromExpression(this._pointOutlineColor);
             }
         },
 
@@ -521,6 +536,7 @@ define([
             },
             set : function(value) {
                 this._pointOutlineWidth = getExpression(this, value);
+                this._style.pointOutlineWidth = getJsonFromExpression(this._pointOutlineWidth);
             }
         },
 
@@ -569,6 +585,7 @@ define([
             },
             set : function(value) {
                 this._labelColor = getExpression(this, value);
+                this._style.labelColor = getJsonFromExpression(this._labelColor);
             }
         },
 
@@ -617,6 +634,7 @@ define([
             },
             set : function(value) {
                 this._labelOutlineColor = getExpression(this, value);
+                this._style.labelOutlineColor = getJsonFromExpression(this._labelOutlineColor);
             }
         },
 
@@ -665,6 +683,7 @@ define([
             },
             set : function(value) {
                 this._labelOutlineWidth = getExpression(this, value);
+                this._style.labelOutlineWidth = getJsonFromExpression(this._labelOutlineWidth);
             }
         },
 
@@ -713,6 +732,7 @@ define([
             },
             set : function(value) {
                 this._font = getExpression(this, value);
+                this._style.font = getJsonFromExpression(this._font);
             }
         },
 
@@ -761,6 +781,7 @@ define([
             },
             set : function(value) {
                 this._labelStyle = getExpression(this, value);
+                this._style.labelStyle = getJsonFromExpression(this._labelStyle);
             }
         },
 
@@ -809,6 +830,7 @@ define([
             },
             set : function(value) {
                 this._labelText = getExpression(this, value);
+                this._style.labelText = getJsonFromExpression(this._labelText);
             }
         },
 
@@ -857,6 +879,7 @@ define([
             },
             set : function(value) {
                 this._backgroundColor = getExpression(this, value);
+                this._style.backgroundColor = getJsonFromExpression(this._backgroundColor);
             }
         },
 
@@ -896,6 +919,7 @@ define([
             },
             set : function(value) {
                 this._backgroundPadding = getExpression(this, value);
+                this._style.backgroundPadding = getJsonFromExpression(this._backgroundPadding);
             }
         },
 
@@ -944,6 +968,7 @@ define([
             },
             set : function(value) {
                 this._backgroundEnabled = getExpression(this, value);
+                this._style.backgroundEnabled = getJsonFromExpression(this._backgroundEnabled);
             }
         },
 
@@ -983,6 +1008,7 @@ define([
             },
             set : function(value) {
                 this._scaleByDistance = getExpression(this, value);
+                this._style.scaleByDistance = getJsonFromExpression(this._scaleByDistance);
             }
         },
 
@@ -1022,6 +1048,7 @@ define([
             },
             set : function(value) {
                 this._translucencyByDistance = getExpression(this, value);
+                this._style.translucencyByDistance = getJsonFromExpression(this._translucencyByDistance);
             }
         },
 
@@ -1061,6 +1088,7 @@ define([
             },
             set : function(value) {
                 this._distanceDisplayCondition = getExpression(this, value);
+                this._style.distanceDisplayCondition = getJsonFromExpression(this._distanceDisplayCondition);
             }
         },
 
@@ -1109,6 +1137,7 @@ define([
             },
             set : function(value) {
                 this._heightOffset = getExpression(this, value);
+                this._style.heightOffset = getJsonFromExpression(this._heightOffset);
             }
         },
 
@@ -1157,6 +1186,7 @@ define([
             },
             set : function(value) {
                 this._anchorLineEnabled = getExpression(this, value);
+                this._style.anchorLineEnabled = getJsonFromExpression(this._anchorLineEnabled);
             }
         },
 
@@ -1205,6 +1235,7 @@ define([
             },
             set : function(value) {
                 this._anchorLineColor = getExpression(this, value);
+                this._style.anchorLineColor = getJsonFromExpression(this._anchorLineColor);
             }
         },
 
@@ -1253,6 +1284,7 @@ define([
             },
             set : function(value) {
                 this._image = getExpression(this, value);
+                this._style.image = getJsonFromExpression(this._image);
             }
         },
 
@@ -1292,6 +1324,7 @@ define([
             },
             set : function(value) {
                 this._disableDepthTestDistance = getExpression(this, value);
+                this._style.disableDepthTestDistance = getJsonFromExpression(this._disableDepthTestDistance);
             }
         },
 
@@ -1340,6 +1373,7 @@ define([
             },
             set : function(value) {
                 this._horizontalOrigin = getExpression(this, value);
+                this._style.horizontalOrigin = getJsonFromExpression(this._horizontalOrigin);
             }
         },
 
@@ -1388,6 +1422,7 @@ define([
             },
             set : function(value) {
                 this._verticalOrigin = getExpression(this, value);
+                this._style.verticalOrigin = getJsonFromExpression(this._verticalOrigin);
             }
         },
 
@@ -1436,6 +1471,7 @@ define([
             },
             set : function(value) {
                 this._labelHorizontalOrigin = getExpression(this, value);
+                this._style.labelHorizontalOrigin = getJsonFromExpression(this._labelHorizontalOrigin);
             }
         },
 
@@ -1484,6 +1520,7 @@ define([
             },
             set : function(value) {
                 this._labelVerticalOrigin = getExpression(this, value);
+                this._style.labelVerticalOrigin = getJsonFromExpression(this._labelVerticalOrigin);
             }
         },
 
diff --git a/Specs/Scene/Cesium3DTileStyleSpec.js b/Specs/Scene/Cesium3DTileStyleSpec.js
index 3f477c4255b4..4f88119fb8ae 100644
--- a/Specs/Scene/Cesium3DTileStyleSpec.js
+++ b/Specs/Scene/Cesium3DTileStyleSpec.js
@@ -1,11 +1,15 @@
 defineSuite([
         'Scene/Cesium3DTileStyle',
+        'Core/Cartesian2',
+        'Core/Cartesian4',
         'Core/Color',
         'Core/Resource',
         'Scene/ConditionsExpression',
         'Scene/Expression'
     ], function(
         Cesium3DTileStyle,
+        Cartesian2,
+        Cartesian4,
         Color,
         Resource,
         ConditionsExpression,
@@ -287,6 +291,28 @@ defineSuite([
         expect(style.show).toBeUndefined();
     });
 
+    it('sets style.show values in setter', function() {
+        var style = new Cesium3DTileStyle({});
+        style.show = '${height} * ${showFactor} >= 1000';
+        expect(style.style.show).toEqual('${height} * ${showFactor} >= 1000');
+
+        style.show = false;
+        expect(style.style.show).toEqual('false');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > ${showFactor}', 'false'],
+                ['true', 'true']
+            ]
+        };
+
+        style.show = jsonExp;
+        expect(style.style.show).toEqual(jsonExp);
+
+        style.show = undefined;
+        expect(style.style.show).toBeUndefined();
+    });
+
     it('sets color value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.color).toBeUndefined();
@@ -347,6 +373,27 @@ defineSuite([
         expect(style.color).toBeUndefined();
     });
 
+    it('sets style.color expression in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        var stringExp = 'color("red")';
+        style.color = new Expression(stringExp);
+        expect(style.style.color).toEqual(stringExp);
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.color = new ConditionsExpression(jsonExp);
+        expect(style.style.color).toEqual(jsonExp);
+
+        style.color = undefined;
+        expect(style.style.color).toBeUndefined();
+    });
+
     it('sets color values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -367,6 +414,23 @@ defineSuite([
         expect(style.color).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.color values in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.color = 'color("${targetColor}")';
+        expect(style.style.color).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.color = jsonExp;
+        expect(style.style.color).toEqual(jsonExp);
+    });
+
     it('sets pointSize value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.pointSize).toBeUndefined();
@@ -430,6 +494,31 @@ defineSuite([
         expect(style.pointSize).toBeUndefined();
     });
 
+    it('sets style.pointSize expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.pointSize = new Expression('2');
+        expect(style.style.pointSize).toEqual('2');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '2.0']
+            ]
+        };
+        style.pointSize = new ConditionsExpression(jsonExp);
+        expect(style.style.pointSize).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.pointSize = customExpression;
+        expect(style.style.pointSize).toEqual(customExpression);
+
+        style.pointSize = undefined;
+        expect(style.style.pointSize).toBeUndefined();
+    });
+
     it('sets pointSize values in setter', function() {
         var defines = {
             'targetPointSize': '2.0'
@@ -453,6 +542,29 @@ defineSuite([
         expect(style.pointSize).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.pointSize values in setter', function() {
+        var defines = {
+            'targetPointSize': '2.0'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.pointSize = 2;
+        expect(style.style.pointSize).toEqual('2');
+
+        style.pointSize = '${targetPointSize} + 1.0';
+        expect(style.style.pointSize).toEqual('${targetPointSize} + 1.0');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '${targetPointSize}']
+            ]
+        };
+
+        style.pointSize = jsonExp;
+        expect(style.style.pointSize).toEqual(jsonExp);
+    });
+
     it('sets pointOutlineColor value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.pointOutlineColor).toBeUndefined();
@@ -513,6 +625,33 @@ defineSuite([
         expect(style.pointOutlineColor).toBeUndefined();
     });
 
+    it('sets style.pointOutlineColor expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.pointOutlineColor = new Expression('color("red")');
+        expect(style.style.pointOutlineColor).toEqual('color("red")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.pointOutlineColor = new ConditionsExpression(jsonExp);
+        expect(style.style.pointOutlineColor).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return Color.RED; },
+            evaluateColor: function() { return Color.RED; }
+        };
+        style.pointOutlineColor = customExpression;
+        expect(style.style.pointOutlineColor).toEqual(customExpression);
+
+        style.pointOutlineColor = undefined;
+        expect(style.style.pointOutlineColor).toBeUndefined();
+    });
+
     it('sets pointOutlineColor values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -533,6 +672,26 @@ defineSuite([
         expect(style.pointOutlineColor).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.pointOutlineColor values in setter', function() {
+        var defines = {
+            'targetColor': 'red'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.pointOutlineColor = 'color("${targetColor}")';
+        expect(style.style.pointOutlineColor).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.pointOutlineColor = jsonExp;
+        expect(style.style.pointOutlineColor).toEqual(jsonExp);
+    });
+
     it('sets pointOutlineWidth value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.pointOutlineWidth).toBeUndefined();
@@ -596,6 +755,31 @@ defineSuite([
         expect(style.pointOutlineWidth).toBeUndefined();
     });
 
+    it('sets style.pointOutlineWidth expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.pointOutlineWidth = new Expression('2');
+        expect(style.style.pointOutlineWidth).toEqual('2');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '2.0']
+            ]
+        };
+        style.pointOutlineWidth = new ConditionsExpression(jsonExp);
+        expect(style.style.pointOutlineWidth).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.pointOutlineWidth = customExpression;
+        expect(style.style.pointOutlineWidth).toEqual(customExpression);
+
+        style.pointOutlineWidth = undefined;
+        expect(style.style.pointOutlineWidth).toBeUndefined();
+    });
+
     it('sets pointOutlineWidth values in setter', function() {
         var defines = {
             'targetPointSize': '2.0'
@@ -619,6 +803,29 @@ defineSuite([
         expect(style.pointOutlineWidth).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.pointOutlineWidth values in setter', function() {
+        var defines = {
+            'targetPointSize': '2.0'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.pointOutlineWidth = 2;
+        expect(style.style.pointOutlineWidth).toEqual('2');
+
+        style.pointOutlineWidth = '${targetPointSize} + 1.0';
+        expect(style.style.pointOutlineWidth).toEqual('${targetPointSize} + 1.0');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '${targetPointSize}']
+            ]
+        };
+
+        style.pointOutlineWidth = jsonExp;
+        expect(style.style.pointOutlineWidth).toEqual(jsonExp);
+    });
+
     it('sets labelColor value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelColor).toBeUndefined();
@@ -679,6 +886,32 @@ defineSuite([
         expect(style.labelColor).toBeUndefined();
     });
 
+    it('sets style.labelColor expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelColor = new Expression('color("red")');
+        expect(style.style.labelColor).toEqual('color("red")');
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.labelColor = new ConditionsExpression(jsonExp);
+        expect(style.style.labelColor).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return Color.RED; },
+            evaluateColor: function() { return Color.RED; }
+        };
+        style.labelColor = customExpression;
+        expect(style.style.labelColor).toEqual(customExpression);
+
+        style.labelColor = undefined;
+        expect(style.style.labelColor).toBeUndefined();
+    });
+
     it('sets labelColor values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -699,6 +932,26 @@ defineSuite([
         expect(style.labelColor).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelColor values in setter', function() {
+        var defines = {
+            'targetColor': 'red'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelColor = 'color("${targetColor}")';
+        expect(style.style.labelColor).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.labelColor = jsonExp;
+        expect(style.style.labelColor).toEqual(jsonExp);
+    });
+
     it('sets labelOutlineColor value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelOutlineColor).toBeUndefined();
@@ -759,6 +1012,33 @@ defineSuite([
         expect(style.labelOutlineColor).toBeUndefined();
     });
 
+    it('sets style.labelOutlineColor expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelOutlineColor = new Expression('color("red")');
+        expect(style.style.labelOutlineColor).toEqual('color("red")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.labelOutlineColor = new ConditionsExpression(jsonExp);
+        expect(style.style.labelOutlineColor).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return Color.RED; },
+            evaluateColor: function() { return Color.RED; }
+        };
+        style.labelOutlineColor = customExpression;
+        expect(style.style.labelOutlineColor).toEqual(customExpression);
+
+        style.labelOutlineColor = undefined;
+        expect(style.style.labelOutlineColor).toBeUndefined();
+    });
+
     it('sets labelOutlineColor values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -779,6 +1059,26 @@ defineSuite([
         expect(style.labelOutlineColor).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelOutlineColor values in setter', function() {
+        var defines = {
+            'targetColor': 'red'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelOutlineColor = 'color("${targetColor}")';
+        expect(style.style.labelOutlineColor).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.labelOutlineColor = jsonExp;
+        expect(style.style.labelOutlineColor).toEqual(jsonExp);
+    });
+
     it('sets labelOutlineWidth value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelOutlineWidth).toBeUndefined();
@@ -842,6 +1142,30 @@ defineSuite([
         expect(style.labelOutlineWidth).toBeUndefined();
     });
 
+    it('sets style.labelOutlineWidth expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelOutlineWidth = new Expression('2');
+        expect(style.style.labelOutlineWidth).toEqual('2');
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '2.0']
+            ]
+        };
+        style.labelOutlineWidth = new ConditionsExpression(jsonExp);
+        expect(style.style.labelOutlineWidth).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.labelOutlineWidth = customExpression;
+        expect(style.style.labelOutlineWidth).toEqual(customExpression);
+
+        style.labelOutlineWidth = undefined;
+        expect(style.style.labelOutlineWidth).toBeUndefined();
+    });
+
     it('sets labelOutlineWidth values in setter', function() {
         var defines = {
             'targetLabelSize': '2.0'
@@ -865,6 +1189,29 @@ defineSuite([
         expect(style.labelOutlineWidth).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelOutlineWidth values in setter', function() {
+        var defines = {
+            'targetLabelSize': '2.0'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelOutlineWidth = 2;
+        expect(style.style.labelOutlineWidth).toEqual('2');
+
+        style.labelOutlineWidth = '${targetLabelSize} + 1.0';
+        expect(style.style.labelOutlineWidth).toEqual('${targetLabelSize} + 1.0');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '${targetLabelSize}']
+            ]
+        };
+
+        style.labelOutlineWidth = jsonExp;
+        expect(style.style.labelOutlineWidth).toEqual(jsonExp);
+    });
+
     it('sets font value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.font).toBeUndefined();
@@ -928,21 +1275,47 @@ defineSuite([
         expect(style.font).toBeUndefined();
     });
 
-    it('sets font values in setter', function() {
-        var defines = {
-            'targetFont': '\'30px Helvetica\''
-        };
-        var style = new Cesium3DTileStyle({ 'defines': defines });
-
-        style.font = '\'24px Helvetica\'';
-        expect(style.font).toEqual(new Expression('\'24px Helvetica\''));
+    it('sets style.font expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
 
-        style.font = '${targetFont}';
-        expect(style.font).toEqual(new Expression('${targetFont}', defines));
+        style.font = new Expression('\'24px Helvetica\'');
+        expect(style.style.font).toEqual('\'24px Helvetica\'');
 
         var jsonExp = {
             conditions : [
-                ['${height} > 2', '\'24px Helvetica\''],
+                ['${height} > 2', '\'30px Helvetica\''],
+                ['true', '\'24px Helvetica\'']
+            ]
+        };
+
+        style.font = new ConditionsExpression(jsonExp);
+        expect(style.style.font).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return '\'24px Helvetica\''; }
+        };
+        style.font = customExpression;
+        expect(style.style.font).toEqual(customExpression);
+
+        style.font = undefined;
+        expect(style.style.font).toBeUndefined();
+    });
+
+    it('sets font values in setter', function() {
+        var defines = {
+            'targetFont': '\'30px Helvetica\''
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.font = '\'24px Helvetica\'';
+        expect(style.font).toEqual(new Expression('\'24px Helvetica\''));
+
+        style.font = '${targetFont}';
+        expect(style.font).toEqual(new Expression('${targetFont}', defines));
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'24px Helvetica\''],
                 ['true', '${targetFont}']
             ]
         };
@@ -951,6 +1324,29 @@ defineSuite([
         expect(style.font).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.font values in setter', function() {
+        var defines = {
+            'targetFont': '\'30px Helvetica\''
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.font = '\'24px Helvetica\'';
+        expect(style.style.font).toEqual('\'24px Helvetica\'');
+
+        style.font = '${targetFont}';
+        expect(style.style.font).toEqual('${targetFont}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'24px Helvetica\''],
+                ['true', '${targetFont}']
+            ]
+        };
+
+        style.font = jsonExp;
+        expect(style.style.font).toEqual(jsonExp);
+    });
+
     it('sets labelStyle value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelStyle).toBeUndefined();
@@ -1004,6 +1400,31 @@ defineSuite([
         expect(style.labelStyle).toBeUndefined();
     });
 
+    it('sets style.labelStyle expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelStyle = new Expression('2');
+        expect(style.style.labelStyle).toEqual('2');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '2']
+            ]
+        };
+        style.labelStyle = new ConditionsExpression(jsonExp);
+        expect(style.style.labelStyle).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 0; }
+        };
+        style.labelStyle = customExpression;
+        expect(style.style.labelStyle).toEqual(customExpression);
+
+        style.labelStyle = undefined;
+        expect(style.style.labelStyle).toBeUndefined();
+    });
+
     it('sets labelStyle values in setter', function() {
         var defines = {
             'targetLabelStyle': '2'
@@ -1027,6 +1448,29 @@ defineSuite([
         expect(style.labelStyle).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelStyle values in setter', function() {
+        var defines = {
+            'targetLabelStyle': '2'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelStyle = 2;
+        expect(style.style.labelStyle).toEqual('2');
+
+        style.labelStyle = '${targetLabelStyle}';
+        expect(style.style.labelStyle).toEqual('${targetLabelStyle}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '${targetLabelStyle}']
+            ]
+        };
+
+        style.labelStyle = jsonExp;
+        expect(style.style.labelStyle).toEqual(jsonExp);
+    });
+
     it('sets labelText value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelText).toBeUndefined();
@@ -1090,6 +1534,32 @@ defineSuite([
         expect(style.labelText).toBeUndefined();
     });
 
+    it('sets style.labelText expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelText = new Expression('\'test text\'');
+        expect(style.style.labelText).toEqual('\'test text\'');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'test text 1\''],
+                ['true', '\'test text 2\'']
+            ]
+        };
+
+        style.labelText = new ConditionsExpression(jsonExp);
+        expect(style.style.labelText).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return '\'test text 1\''; }
+        };
+        style.labelText = customExpression;
+        expect(style.style.labelText).toEqual(customExpression);
+
+        style.labelText = undefined;
+        expect(style.style.labelText).toBeUndefined();
+    });
+
     it('sets labelText values in setter', function() {
         var defines = {
             'targetText': '\'test text 1\''
@@ -1113,6 +1583,29 @@ defineSuite([
         expect(style.labelText).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelText values in setter', function() {
+        var defines = {
+            'targetText': '\'test text 1\''
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelText = '\'test text\'';
+        expect(style.style.labelText).toEqual('\'test text\'');
+
+        style.labelText = '${targetText}';
+        expect(style.style.labelText).toEqual('${targetText}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'test text 2\''],
+                ['true', '${targetText}']
+            ]
+        };
+
+        style.labelText = jsonExp;
+        expect(style.style.labelText).toEqual(jsonExp);
+    });
+
     it('sets backgroundColor value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.backgroundColor).toBeUndefined();
@@ -1173,6 +1666,33 @@ defineSuite([
         expect(style.backgroundColor).toBeUndefined();
     });
 
+    it('sets style.backgroundColor expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.backgroundColor = new Expression('color("red")');
+        expect(style.style.backgroundColor).toEqual('color("red")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.backgroundColor = new ConditionsExpression(jsonExp);
+        expect(style.style.backgroundColor).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return Color.RED; },
+            evaluateColor: function() { return Color.RED; }
+        };
+        style.backgroundColor = customExpression;
+        expect(style.style.backgroundColor).toEqual(customExpression);
+
+        style.backgroundColor = undefined;
+        expect(style.style.backgroundColor).toBeUndefined();
+    });
+
     it('sets backgroundColor values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -1193,6 +1713,26 @@ defineSuite([
         expect(style.backgroundColor).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.backgroundColor values in setter', function() {
+        var defines = {
+            'targetColor': 'red'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.backgroundColor = 'color("${targetColor}")';
+        expect(style.style.backgroundColor).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.backgroundColor = jsonExp;
+        expect(style.style.backgroundColor).toEqual(jsonExp);
+    });
+
     it('sets backgroundPadding value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.backgroundPadding).toBeUndefined();
@@ -1253,6 +1793,32 @@ defineSuite([
         expect(style.backgroundPadding).toBeUndefined();
     });
 
+    it('sets style.backgroundPadding expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.backgroundPadding = new Expression('vec2(1.0, 2.0)');
+        expect(style.style.backgroundPadding).toEqual('vec2(1.0, 2.0)');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec2(1.0, 2.0)'],
+                ['true', 'vec2(3.0, 4.0)']
+            ]
+        };
+
+        var customExpression = {
+            evaluate: function() { return new Cartesian2(1.0, 2.0); }
+        };
+        style.labelText = customExpression;
+        expect(style.style.labelText).toEqual(customExpression);
+
+        style.backgroundPadding = new ConditionsExpression(jsonExp);
+        expect(style.style.backgroundPadding).toEqual(jsonExp);
+
+        style.backgroundPadding = undefined;
+        expect(style.style.backgroundPadding).toBeUndefined();
+    });
+
     it('sets backgroundPadding values in setter', function() {
         var defines = {
             'targetPadding': '3.0, 4.0'
@@ -1273,6 +1839,26 @@ defineSuite([
         expect(style.backgroundPadding).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.backgroundPadding values in setter', function() {
+        var defines = {
+            'targetPadding': '3.0, 4.0'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.backgroundPadding = 'vec2("${targetPadding}")';
+        expect(style.style.backgroundPadding).toEqual('vec2("${targetPadding}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec2(1.0, 2.0)'],
+                ['true', 'vec2("${targetPadding}")']
+            ]
+        };
+
+        style.backgroundPadding = jsonExp;
+        expect(style.style.backgroundPadding).toEqual(jsonExp);
+    });
+
     it('sets backgroundEnabled value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.backgroundEnabled).toBeUndefined();
@@ -1340,6 +1926,29 @@ defineSuite([
         expect(style.backgroundEnabled).toEqual(exp);
     });
 
+    it('sets style.backgroundEnabled expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.backgroundEnabled = new Expression('false');
+        expect(style.style.backgroundEnabled).toEqual('false');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'false'],
+                ['true', 'true']
+            ]
+        };
+
+        style.backgroundEnabled = new ConditionsExpression(jsonExp);
+        expect(style.style.backgroundEnabled).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return true; }
+        };
+        style.backgroundEnabled = customExpression;
+        expect(style.style.backgroundEnabled).toEqual(customExpression);
+    });
+
     it('sets backgroundEnabled values in setter', function() {
         var defines = {
             'backgroundFactor': 10
@@ -1366,6 +1975,32 @@ defineSuite([
         expect(style.backgroundEnabled).toBeUndefined();
     });
 
+    it('sets style.backgroundEnabled values in setter', function() {
+        var defines = {
+            'backgroundFactor': 10
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.backgroundEnabled = '${height} * ${backgroundFactor} >= 1000';
+        expect(style.style.backgroundEnabled).toEqual('${height} * ${backgroundFactor} >= 1000');
+
+        style.backgroundEnabled = false;
+        expect(style.style.backgroundEnabled).toEqual('false');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > ${backgroundFactor}', 'false'],
+                ['true', 'true']
+            ]
+        };
+
+        style.backgroundEnabled = jsonExp;
+        expect(style.style.backgroundEnabled).toEqual(jsonExp);
+
+        style.backgroundEnabled = undefined;
+        expect(style.style.backgroundEnabled).toBeUndefined();
+    });
+
     it('sets scaleByDistance value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.scaleByDistance).toBeUndefined();
@@ -1426,6 +2061,32 @@ defineSuite([
         expect(style.scaleByDistance).toBeUndefined();
     });
 
+    it('sets style.scaleByDistance expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.scaleByDistance = new Expression('vec4(5.0, 6.0, 7.0, 8.0)');
+        expect(style.style.scaleByDistance).toEqual('vec4(5.0, 6.0, 7.0, 8.0)');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec4(1.0, 2.0, 3.0, 4.0)'],
+                ['true', 'vec4(5.0, 6.0, 7.0, 8.0)']
+            ]
+        };
+
+        style.scaleByDistance = new ConditionsExpression(jsonExp);
+        expect(style.style.scaleByDistance).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return new Cartesian4(1.0, 2.0, 3.0, 4.0); }
+        };
+        style.scaleByDistance = customExpression;
+        expect(style.style.scaleByDistance).toEqual(customExpression);
+
+        style.scaleByDistance = undefined;
+        expect(style.style.scaleByDistance).toBeUndefined();
+    });
+
     it('sets scaleByDistance values in setter', function() {
         var defines = {
             'targetScale': '1.0, 2.0, 3.0, 4.'
@@ -1446,6 +2107,26 @@ defineSuite([
         expect(style.scaleByDistance).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.scaleByDistance values in setter', function() {
+        var defines = {
+            'targetScale': '1.0, 2.0, 3.0, 4.'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.scaleByDistance = 'vec4("${targetScale}")';
+        expect(style.style.scaleByDistance).toEqual('vec4("${targetScale}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec4(5.0, 6.0, 7.0, 8.0)'],
+                ['true', 'vec4("${targetScale}")']
+            ]
+        };
+
+        style.scaleByDistance = jsonExp;
+        expect(style.style.scaleByDistance).toEqual(jsonExp);
+    });
+
     it('sets distanceDisplayCondition value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.distanceDisplayCondition).toBeUndefined();
@@ -1506,6 +2187,32 @@ defineSuite([
         expect(style.distanceDisplayCondition).toBeUndefined();
     });
 
+    it('sets style.distanceDisplayCondition expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.distanceDisplayCondition = new Expression('vec4(5.0, 6.0, 7.0, 8.0)');
+        expect(style.style.distanceDisplayCondition).toEqual('vec4(5.0, 6.0, 7.0, 8.0)');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec4(1.0, 2.0, 3.0, 4.0)'],
+                ['true', 'vec4(5.0, 6.0, 7.0, 8.0)']
+            ]
+        };
+
+        style.distanceDisplayCondition = new ConditionsExpression(jsonExp);
+        expect(style.style.distanceDisplayCondition).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return new Cartesian4(1.0, 2.0, 3.0, 4.0); }
+        };
+        style.distanceDisplayCondition = customExpression;
+        expect(style.style.distanceDisplayCondition).toEqual(customExpression);
+
+        style.distanceDisplayCondition = undefined;
+        expect(style.style.distanceDisplayCondition).toBeUndefined();
+    });
+
     it('sets distanceDisplayCondition values in setter', function() {
         var defines = {
             'targetTranslucency': '1.0, 2.0, 3.0, 4.'
@@ -1526,6 +2233,26 @@ defineSuite([
         expect(style.distanceDisplayCondition).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.distanceDisplayCondition values in setter', function() {
+        var defines = {
+            'targetTranslucency': '1.0, 2.0, 3.0, 4.'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.distanceDisplayCondition = 'vec4("${targetTranslucency}")';
+        expect(style.style.distanceDisplayCondition).toEqual('vec4("${targetTranslucency}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'vec4(5.0, 6.0, 7.0, 8.0)'],
+                ['true', 'vec4("${targetTranslucency}")']
+            ]
+        };
+
+        style.distanceDisplayCondition = jsonExp;
+        expect(style.style.distanceDisplayCondition).toEqual(jsonExp);
+    });
+
     it('sets heightOffset value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.heightOffset).toBeUndefined();
@@ -1589,6 +2316,32 @@ defineSuite([
         expect(style.heightOffset).toBeUndefined();
     });
 
+    it('sets style.heightOffset expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.heightOffset = new Expression('2');
+        expect(style.style.heightOffset).toEqual('2');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '2.0']
+            ]
+        };
+
+        style.heightOffset = new ConditionsExpression(jsonExp);
+        expect(style.style.heightOffset).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 2; }
+        };
+        style.heightOffset = customExpression;
+        expect(style.style.heightOffset).toEqual(customExpression);
+
+        style.heightOffset = undefined;
+        expect(style.style.heightOffset).toBeUndefined();
+    });
+
     it('sets heightOffset values in setter', function() {
         var defines = {
             'targetHeight': '2.0'
@@ -1612,6 +2365,26 @@ defineSuite([
         expect(style.heightOffset).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.heightOffset values in setter', function() {
+        var defines = {
+            'targetHeight': '2.0'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.heightOffset = '${targetHeight} + 1.0';
+        expect(style.style.heightOffset).toEqual('${targetHeight} + 1.0');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '${targetHeight}']
+            ]
+        };
+
+        style.heightOffset = jsonExp;
+        expect(style.style.heightOffset).toEqual(jsonExp);
+    });
+
     it('sets anchorLineEnabled value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.anchorLineEnabled).toBeUndefined();
@@ -1664,19 +2437,42 @@ defineSuite([
     it('sets anchorLineEnabled expressions in setter', function() {
         var style = new Cesium3DTileStyle();
 
-        var condExp = new ConditionsExpression({
+        var condExp = new ConditionsExpression({
+            conditions : [
+                ['${height} > 2', 'false'],
+                ['true', 'true']
+            ]
+        });
+
+        style.anchorLineEnabled = condExp;
+        expect(style.anchorLineEnabled).toEqual(condExp);
+
+        var exp = new Expression('false');
+        style.anchorLineEnabled = exp;
+        expect(style.anchorLineEnabled).toEqual(exp);
+    });
+
+    it('sets style.anchorLineEnabled expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.anchorLineEnabled = new Expression('false');
+        expect(style.style.anchorLineEnabled).toEqual('false');
+
+        var jsonExp = {
             conditions : [
                 ['${height} > 2', 'false'],
                 ['true', 'true']
             ]
-        });
+        };
 
-        style.anchorLineEnabled = condExp;
-        expect(style.anchorLineEnabled).toEqual(condExp);
+        style.anchorLineEnabled = new ConditionsExpression(jsonExp);
+        expect(style.style.anchorLineEnabled).toEqual(jsonExp);
 
-        var exp = new Expression('false');
-        style.anchorLineEnabled = exp;
-        expect(style.anchorLineEnabled).toEqual(exp);
+        var customExpression = {
+            evaluate: function() { return true; }
+        };
+        style.anchorLineEnabled = customExpression;
+        expect(style.style.anchorLineEnabled).toEqual(customExpression);
     });
 
     it('sets anchorLineEnabled values in setter', function() {
@@ -1705,6 +2501,32 @@ defineSuite([
         expect(style.anchorLineEnabled).toBeUndefined();
     });
 
+    it('sets style.anchorLineEnabled values in setter', function() {
+        var defines = {
+            'anchorFactor': 10
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.anchorLineEnabled = '${height} * ${anchorFactor} >= 1000';
+        expect(style.style.anchorLineEnabled).toEqual('${height} * ${anchorFactor} >= 1000');
+
+        style.anchorLineEnabled = false;
+        expect(style.style.anchorLineEnabled).toEqual('false');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > ${anchorFactor}', 'false'],
+                ['true', 'true']
+            ]
+        };
+
+        style.anchorLineEnabled = jsonExp;
+        expect(style.style.anchorLineEnabled).toEqual(jsonExp);
+
+        style.anchorLineEnabled = undefined;
+        expect(style.style.anchorLineEnabled).toBeUndefined();
+    });
+
     it('sets anchorLineColor value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.anchorLineColor).toBeUndefined();
@@ -1765,6 +2587,33 @@ defineSuite([
         expect(style.anchorLineColor).toBeUndefined();
     });
 
+    it('sets style.anchorLineColor expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.anchorLineColor = new Expression('color("red")');
+        expect(style.style.anchorLineColor).toEqual('color("red")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("blue")']
+            ]
+        };
+
+        style.anchorLineColor = new ConditionsExpression(jsonExp);
+        expect(style.style.anchorLineColor).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return Color.RED; },
+            evaluateColor: function() { return Color.RED; }
+        };
+        style.anchorLineColor = customExpression;
+        expect(style.style.anchorLineColor).toEqual(customExpression);
+
+        style.anchorLineColor = undefined;
+        expect(style.style.anchorLineColor).toBeUndefined();
+    });
+
     it('sets anchorLineColor values in setter', function() {
         var defines = {
             'targetColor': 'red'
@@ -1785,6 +2634,26 @@ defineSuite([
         expect(style.anchorLineColor).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.anchorLineColor values in setter', function() {
+        var defines = {
+            'targetColor': 'red'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.anchorLineColor = 'color("${targetColor}")';
+        expect(style.style.anchorLineColor).toEqual('color("${targetColor}")');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', 'color("cyan")'],
+                ['true', 'color("${targetColor}")']
+            ]
+        };
+
+        style.anchorLineColor = jsonExp;
+        expect(style.style.anchorLineColor).toEqual(jsonExp);
+    });
+
     it('sets image value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.image).toBeUndefined();
@@ -1848,6 +2717,32 @@ defineSuite([
         expect(style.image).toBeUndefined();
     });
 
+    it('sets style.image expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.image = new Expression('\'url/to/image\'');
+        expect(style.style.image).toEqual('\'url/to/image\'');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'url/to/image1\''],
+                ['true', '\'url/to/image2\'']
+            ]
+        };
+
+        style.image = new ConditionsExpression(jsonExp);
+        expect(style.style.image).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return '\'url/to/image1\''; }
+        };
+        style.image = customExpression;
+        expect(style.style.image).toEqual(customExpression);
+
+        style.image = undefined;
+        expect(style.style.image).toBeUndefined();
+    });
+
     it('sets image values in setter', function() {
         var defines = {
             'targetUrl': '\'url/to/image1\''
@@ -1871,6 +2766,29 @@ defineSuite([
         expect(style.image).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.image values in setter', function() {
+        var defines = {
+            'targetUrl': '\'url/to/image1\''
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.image = '\'url/to/image\'';
+        expect(style.style.image).toEqual('\'url/to/image\'');
+
+        style.image = '${targetUrl}';
+        expect(style.style.image).toEqual('${targetUrl}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '\'url/to/image2\''],
+                ['true', '${targetUrl}']
+            ]
+        };
+
+        style.image = jsonExp;
+        expect(style.style.image).toEqual(jsonExp);
+    });
+
     it('sets disableDepthTestDistance value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.disableDepthTestDistance).toBeUndefined();
@@ -1934,6 +2852,32 @@ defineSuite([
         expect(style.disableDepthTestDistance).toBeUndefined();
     });
 
+    it('sets style.disableDepthTestDistance expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.disableDepthTestDistance = new Expression('2');
+        expect(style.style.disableDepthTestDistance).toEqual('2');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1.0'],
+                ['true', '2.0']
+            ]
+        };
+
+        style.disableDepthTestDistance = new ConditionsExpression(jsonExp);
+        expect(style.style.disableDepthTestDistance).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1.0; }
+        };
+        style.disableDepthTestDistance = customExpression;
+        expect(style.style.disableDepthTestDistance).toEqual(customExpression);
+
+        style.disableDepthTestDistance = undefined;
+        expect(style.style.disableDepthTestDistance).toBeUndefined();
+    });
+
     it('sets disableDepthTestDistance values in setter', function() {
         var defines = {
             'targetDistance': '2.0'
@@ -2010,6 +2954,32 @@ defineSuite([
         expect(style.horizontalOrigin).toBeUndefined();
     });
 
+    it('sets style.horizontalOrigin expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.horizontalOrigin = new Expression('1');
+        expect(style.style.horizontalOrigin).toEqual('1');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '-1']
+            ]
+        };
+
+        style.horizontalOrigin = new ConditionsExpression(jsonExp);
+        expect(style.style.horizontalOrigin).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.horizontalOrigin = customExpression;
+        expect(style.style.horizontalOrigin).toEqual(customExpression);
+
+        style.horizontalOrigin = undefined;
+        expect(style.style.horizontalOrigin).toBeUndefined();
+    });
+
     it('sets horizontalOrigin values in setter', function() {
         var defines = {
             'targetOrigin': '-1'
@@ -2033,6 +3003,29 @@ defineSuite([
         expect(style.horizontalOrigin).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.horizontalOrigin values in setter', function() {
+        var defines = {
+            'targetOrigin': '-1'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.horizontalOrigin = -1;
+        expect(style.style.horizontalOrigin).toEqual('-1');
+
+        style.horizontalOrigin = '${targetOrigin}';
+        expect(style.style.horizontalOrigin).toEqual('${targetOrigin}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '${targetOrigin}']
+            ]
+        };
+
+        style.horizontalOrigin = jsonExp;
+        expect(style.style.horizontalOrigin).toEqual(jsonExp);
+    });
+
     it('sets verticalOrigin value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.verticalOrigin).toBeUndefined();
@@ -2086,6 +3079,32 @@ defineSuite([
         expect(style.verticalOrigin).toBeUndefined();
     });
 
+    it('sets style.styleverticalOrigin expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.verticalOrigin = new Expression('1');
+        expect(style.style.verticalOrigin).toEqual('1');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '-1']
+            ]
+        };
+
+        style.verticalOrigin = new ConditionsExpression(jsonExp);
+        expect(style.style.verticalOrigin).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.verticalOrigin = customExpression;
+        expect(style.style.verticalOrigin).toEqual(customExpression);
+
+        style.verticalOrigin = undefined;
+        expect(style.style.verticalOrigin).toBeUndefined();
+    });
+
     it('sets verticalOrigin values in setter', function() {
         var defines = {
             'targetOrigin': '-1'
@@ -2109,6 +3128,29 @@ defineSuite([
         expect(style.verticalOrigin).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.verticalOrigin values in setter', function() {
+        var defines = {
+            'targetOrigin': '-1'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.verticalOrigin = -1;
+        expect(style.style.verticalOrigin).toEqual('-1');
+
+        style.verticalOrigin = '${targetOrigin}';
+        expect(style.style.verticalOrigin).toEqual('${targetOrigin}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '${targetOrigin}']
+            ]
+        };
+
+        style.verticalOrigin = jsonExp;
+        expect(style.style.verticalOrigin).toEqual(jsonExp);
+    });
+
     it('sets labelHorizontalOrigin value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelHorizontalOrigin).toBeUndefined();
@@ -2162,6 +3204,32 @@ defineSuite([
         expect(style.labelHorizontalOrigin).toBeUndefined();
     });
 
+    it('sets style.labelHorizontalOrigin expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelHorizontalOrigin = new Expression('1');
+        expect(style.style.labelHorizontalOrigin).toEqual('1');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '-1']
+            ]
+        };
+
+        style.labelHorizontalOrigin = new ConditionsExpression(jsonExp);
+        expect(style.style.labelHorizontalOrigin).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.labelHorizontalOrigin = customExpression;
+        expect(style.style.labelHorizontalOrigin).toEqual(customExpression);
+
+        style.labelHorizontalOrigin = undefined;
+        expect(style.style.labelHorizontalOrigin).toBeUndefined();
+    });
+
     it('sets labelHorizontalOrigin values in setter', function() {
         var defines = {
             'targetOrigin': '-1'
@@ -2185,6 +3253,29 @@ defineSuite([
         expect(style.labelHorizontalOrigin).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelHorizontalOrigin values in setter', function() {
+        var defines = {
+            'targetOrigin': '-1'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelHorizontalOrigin = -1;
+        expect(style.style.labelHorizontalOrigin).toEqual('-1');
+
+        style.labelHorizontalOrigin = '${targetOrigin}';
+        expect(style.style.labelHorizontalOrigin).toEqual('${targetOrigin}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '${targetOrigin}']
+            ]
+        };
+
+        style.labelHorizontalOrigin = jsonExp;
+        expect(style.style.labelHorizontalOrigin).toEqual(jsonExp);
+    });
+
     it('sets labelVerticalOrigin value to undefined if value not present', function() {
         var style = new Cesium3DTileStyle({});
         expect(style.labelVerticalOrigin).toBeUndefined();
@@ -2238,6 +3329,32 @@ defineSuite([
         expect(style.labelVerticalOrigin).toBeUndefined();
     });
 
+    it('sets style.labelVerticalOrigin expressions in setter', function() {
+        var style = new Cesium3DTileStyle();
+
+        style.labelVerticalOrigin = new Expression('1');
+        expect(style.style.labelVerticalOrigin).toEqual('1');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '-1']
+            ]
+        };
+
+        style.labelVerticalOrigin = new ConditionsExpression(jsonExp);
+        expect(style.style.labelVerticalOrigin).toEqual(jsonExp);
+
+        var customExpression = {
+            evaluate: function() { return 1; }
+        };
+        style.labelVerticalOrigin = customExpression;
+        expect(style.style.labelVerticalOrigin).toEqual(customExpression);
+
+        style.labelVerticalOrigin = undefined;
+        expect(style.style.labelVerticalOrigin).toBeUndefined();
+    });
+
     it('sets labelVerticalOrigin values in setter', function() {
         var defines = {
             'targetOrigin': '-1'
@@ -2261,6 +3378,29 @@ defineSuite([
         expect(style.labelVerticalOrigin).toEqual(new ConditionsExpression(jsonExp, defines));
     });
 
+    it('sets style.labelVerticalOrigin values in setter', function() {
+        var defines = {
+            'targetOrigin': '-1'
+        };
+        var style = new Cesium3DTileStyle({ 'defines': defines });
+
+        style.labelVerticalOrigin = -1;
+        expect(style.style.labelVerticalOrigin).toEqual('-1');
+
+        style.labelVerticalOrigin = '${targetOrigin}';
+        expect(style.style.labelVerticalOrigin).toEqual('${targetOrigin}');
+
+        var jsonExp = {
+            conditions : [
+                ['${height} > 2', '1'],
+                ['true', '${targetOrigin}']
+            ]
+        };
+
+        style.labelVerticalOrigin = jsonExp;
+        expect(style.style.labelVerticalOrigin).toEqual(jsonExp);
+    });
+
     it('throws on accessing style if not ready', function() {
         var style = new Cesium3DTileStyle({});
         style._ready = false;