diff --git a/packages/engine/Source/Scene/Cesium3DTilesVoxelProvider.js b/packages/engine/Source/Scene/Cesium3DTilesVoxelProvider.js
index 5a84f8f9d99c..c319710e159a 100644
--- a/packages/engine/Source/Scene/Cesium3DTilesVoxelProvider.js
+++ b/packages/engine/Source/Scene/Cesium3DTilesVoxelProvider.js
@@ -176,7 +176,14 @@ function Cesium3DTilesVoxelProvider(options) {
 }
 
 Object.defineProperties(Cesium3DTilesVoxelProvider.prototype, {
-  /** @inheritdoc */
+  /**
+   * Gets the promise that will be resolved when the provider is ready for use.
+   *
+   * @memberof Cesium3DTilesVoxelProvider.prototype
+   * @type {Promise<Cesium3DTilesVoxelProvider>}
+   * @readonly
+   * @deprecated
+   */
   readyPromise: {
     get: function () {
       deprecationWarning(
@@ -186,7 +193,15 @@ Object.defineProperties(Cesium3DTilesVoxelProvider.prototype, {
       return this._readyPromise;
     },
   },
-  /** @inheritdoc */
+
+  /**
+   * Gets a value indicating whether or not the provider is ready for use.
+   *
+   * @memberof Cesium3DTilesVoxelProvider.prototype
+   * @type {boolean}
+   * @readonly
+   * @deprecated
+   */
   ready: {
     get: function () {
       deprecationWarning(
diff --git a/packages/engine/Source/Scene/Composite3DTileContent.js b/packages/engine/Source/Scene/Composite3DTileContent.js
index e61d10e819ac..824b01186956 100644
--- a/packages/engine/Source/Scene/Composite3DTileContent.js
+++ b/packages/engine/Source/Scene/Composite3DTileContent.js
@@ -1,5 +1,6 @@
 import defaultValue from "../Core/defaultValue.js";
 import defined from "../Core/defined.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import getMagic from "../Core/getMagic.js";
 import RuntimeError from "../Core/RuntimeError.js";
@@ -30,6 +31,11 @@ function Composite3DTileContent(tileset, tile, resource, contents) {
   this._metadata = undefined;
   this._group = undefined;
   this._ready = false;
+
+  this._resolveContent = undefined;
+  this._readyPromise = new Promise((resolve) => {
+    this._resolveContent = resolve;
+  });
 }
 
 Object.defineProperties(Composite3DTileContent.prototype, {
@@ -126,12 +132,41 @@ Object.defineProperties(Composite3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Composite3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Composite3DTileContent.prototype
+   *
+   * @type {Promise<Composite3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Composite3DTileContent.readyPromise",
+        "Composite3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Composite3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -333,7 +368,10 @@ Composite3DTileContent.prototype.update = function (tileset, frameState) {
     ready = ready && contents[i].ready;
   }
 
-  this._ready = ready;
+  if (!this._ready && ready) {
+    this._ready = true;
+    this._resolveContent(this);
+  }
 };
 
 Composite3DTileContent.prototype.isDestroyed = function () {
diff --git a/packages/engine/Source/Scene/Empty3DTileContent.js b/packages/engine/Source/Scene/Empty3DTileContent.js
index 13f427b0e02b..b9aa4f82144d 100644
--- a/packages/engine/Source/Scene/Empty3DTileContent.js
+++ b/packages/engine/Source/Scene/Empty3DTileContent.js
@@ -1,3 +1,4 @@
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 
@@ -64,12 +65,41 @@ Object.defineProperties(Empty3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Empty3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return true;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Empty3DTileContent.prototype
+   *
+   * @type {Promise<Empty3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Empty3DTileContent.readyPromise",
+        "Empty3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Empty3DTileContent.ready to return true instead."
+      );
+      return Promise.resolve(this);
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
diff --git a/packages/engine/Source/Scene/Geometry3DTileContent.js b/packages/engine/Source/Scene/Geometry3DTileContent.js
index f9ea775d9108..4486ffbb8bf2 100644
--- a/packages/engine/Source/Scene/Geometry3DTileContent.js
+++ b/packages/engine/Source/Scene/Geometry3DTileContent.js
@@ -1,6 +1,7 @@
 import Cartesian3 from "../Core/Cartesian3.js";
 import defaultValue from "../Core/defaultValue.js";
 import defined from "../Core/defined.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 import getJsonFromTypedArray from "../Core/getJsonFromTypedArray.js";
@@ -43,6 +44,13 @@ function Geometry3DTileContent(
   this._group = undefined;
 
   this._ready = false;
+
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  this._resolveContent = undefined;
+  this._readyPromise = new Promise((resolve) => {
+    this._resolveContent = resolve;
+  });
+
   initialize(this, arrayBuffer, byteOffset);
 }
 
@@ -97,12 +105,41 @@ Object.defineProperties(Geometry3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Geometry3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Geometry3DTileContent.prototype
+   *
+   * @type {Promise<Geometry3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Geometry3DTileContent.readyPromise",
+        "Geometry3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Geometry3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -291,7 +328,8 @@ function initialize(content, arrayBuffer, byteOffset) {
   byteOffset += sizeOfUint32;
 
   if (byteLength === 0) {
-    this._ready = true;
+    content._ready = true;
+    content._resolveContent(content);
     return;
   }
 
@@ -512,6 +550,7 @@ Geometry3DTileContent.prototype.update = function (tileset, frameState) {
   if (defined(this._batchTable) && this._geometries.ready) {
     this._batchTable.update(tileset, frameState);
     this._ready = true;
+    this._resolveContent(this);
   }
 };
 
diff --git a/packages/engine/Source/Scene/Implicit3DTileContent.js b/packages/engine/Source/Scene/Implicit3DTileContent.js
index 8f93e9dc5de3..7f6a8314afb7 100644
--- a/packages/engine/Source/Scene/Implicit3DTileContent.js
+++ b/packages/engine/Source/Scene/Implicit3DTileContent.js
@@ -4,6 +4,7 @@ import clone from "../Core/clone.js";
 import combine from "../Core/combine.js";
 import defaultValue from "../Core/defaultValue.js";
 import defined from "../Core/defined.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 import CesiumMath from "../Core/Math.js";
@@ -73,6 +74,7 @@ function Implicit3DTileContent(tileset, tile, resource) {
   this._url = subtreeResource.getUrlComponent(true);
 
   this._ready = false;
+  this._readyPromise = undefined;
 }
 
 Object.defineProperties(Implicit3DTileContent.prototype, {
@@ -118,12 +120,41 @@ Object.defineProperties(Implicit3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Implicit3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Implicit3DTileContent.prototype
+   *
+   * @type {Promise<Implicit3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Implicit3DTileContent.readyPromise",
+        "Implicit3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Implicit3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -229,6 +260,8 @@ Implicit3DTileContent.fromSubtreeJson = async function (
   content._implicitSubtree = subtree;
   expandSubtree(content, subtree);
   content._ready = true;
+  content._readyPromise = Promise.resolve(content);
+
   return content;
 };
 
diff --git a/packages/engine/Source/Scene/Model/Model3DTileContent.js b/packages/engine/Source/Scene/Model/Model3DTileContent.js
index 52c51879f4b8..cd222a39c47d 100644
--- a/packages/engine/Source/Scene/Model/Model3DTileContent.js
+++ b/packages/engine/Source/Scene/Model/Model3DTileContent.js
@@ -2,6 +2,7 @@ import Color from "../../Core/Color.js";
 import combine from "../../Core/combine.js";
 import defined from "../../Core/defined.js";
 import destroyObject from "../../Core/destroyObject.js";
+import deprecationWarning from "../../Core/deprecationWarning.js";
 import DeveloperError from "../../Core/DeveloperError.js";
 import Pass from "../../Renderer/Pass.js";
 import ModelAnimationLoop from "../ModelAnimationLoop.js";
@@ -29,6 +30,9 @@ function Model3DTileContent(tileset, tile, resource) {
   this._metadata = undefined;
   this._group = undefined;
   this._ready = false;
+
+  this._resolveContent = undefined;
+  this._readyPromise = undefined;
 }
 
 Object.defineProperties(Model3DTileContent.prototype, {
@@ -85,12 +89,41 @@ Object.defineProperties(Model3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Model3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Model3DTileContent.prototype
+   *
+   * @type {Promise<Model3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Model3DTileContent.readyPromise",
+        "Model3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Model3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -254,6 +287,7 @@ Model3DTileContent.prototype.update = function (tileset, frameState) {
     });
 
     this._ready = true;
+    this._resolveContent = this._resolveContent && this._resolveContent(this);
   }
 };
 
@@ -290,6 +324,11 @@ Model3DTileContent.fromGltf = async function (tileset, tile, resource, gltf) {
   const model = await Model.fromGltfAsync(modelOptions);
   content._model = model;
 
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  content._readyPromise = new Promise((resolve) => {
+    content._resolveContent = resolve;
+  });
+
   return content;
 };
 
@@ -324,6 +363,11 @@ Model3DTileContent.fromB3dm = async function (
   const model = await Model.fromB3dm(modelOptions);
   content._model = model;
 
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  content._readyPromise = new Promise((resolve) => {
+    content._resolveContent = resolve;
+  });
+
   return content;
 };
 
@@ -352,6 +396,11 @@ Model3DTileContent.fromI3dm = async function (
   const model = await Model.fromI3dm(modelOptions);
   content._model = model;
 
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  content._readyPromise = new Promise((resolve) => {
+    content._resolveContent = resolve;
+  });
+
   return content;
 };
 
@@ -379,6 +428,11 @@ Model3DTileContent.fromPnts = async function (
   const model = await Model.fromPnts(modelOptions);
   content._model = model;
 
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  content._readyPromise = new Promise((resolve) => {
+    content._resolveContent = resolve;
+  });
+
   return content;
 };
 
@@ -404,6 +458,11 @@ Model3DTileContent.fromGeoJson = async function (
   const model = await Model.fromGeoJson(modelOptions);
   content._model = model;
 
+  // This is for backwards compatibility. It can be removed once readyPromise is removed.
+  content._readyPromise = new Promise((resolve) => {
+    content._resolveContent = resolve;
+  });
+
   return content;
 };
 
diff --git a/packages/engine/Source/Scene/Multiple3DTileContent.js b/packages/engine/Source/Scene/Multiple3DTileContent.js
index 65578e434449..10de75a5c2ff 100644
--- a/packages/engine/Source/Scene/Multiple3DTileContent.js
+++ b/packages/engine/Source/Scene/Multiple3DTileContent.js
@@ -1,4 +1,5 @@
 import defined from "../Core/defined.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 import Request from "../Core/Request.js";
@@ -56,6 +57,11 @@ function Multiple3DTileContent(tileset, tile, tilesetResource, contentsJson) {
   this._requests = new Array(contentCount);
   this._ready = false;
 
+  this._resolveContent = undefined;
+  this._readyPromise = new Promise((resolve) => {
+    this._resolveContent = resolve;
+  });
+
   this._innerContentResources = new Array(contentCount);
   this._serverKeys = new Array(contentCount);
 
@@ -211,6 +217,15 @@ Object.defineProperties(Multiple3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Multiple3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       if (!this._contentsCreated) {
@@ -221,6 +236,26 @@ Object.defineProperties(Multiple3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Multiple3DTileContent.prototype
+   *
+   * @type {Promise<Multiple3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Multiple3DTileContent.readyPromise",
+        "Multiple3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Multiple3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -636,7 +671,10 @@ Multiple3DTileContent.prototype.update = function (tileset, frameState) {
     ready = ready && contents[i].ready;
   }
 
-  this._ready = ready;
+  if (!this._ready && ready) {
+    this._ready = true;
+    this._resolveContent(this);
+  }
 };
 
 Multiple3DTileContent.prototype.isDestroyed = function () {
diff --git a/packages/engine/Source/Scene/Tileset3DTileContent.js b/packages/engine/Source/Scene/Tileset3DTileContent.js
index 9d5ba1172c9a..34559190b62c 100644
--- a/packages/engine/Source/Scene/Tileset3DTileContent.js
+++ b/packages/engine/Source/Scene/Tileset3DTileContent.js
@@ -1,4 +1,5 @@
 import destroyObject from "../Core/destroyObject.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 
 /**
  * Represents content for a tile in a
@@ -24,6 +25,7 @@ function Tileset3DTileContent(tileset, tile, resource) {
   this._group = undefined;
 
   this._ready = false;
+  this._readyPromise = Promise.resolve(this);
 }
 
 Object.defineProperties(Tileset3DTileContent.prototype, {
@@ -69,12 +71,41 @@ Object.defineProperties(Tileset3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Tileset3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Tileset3DTileContent.prototype
+   *
+   * @type {Promise<Tileset3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Tileset3DTileContent.readyPromise",
+        "Tileset3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Tileset3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -130,6 +161,7 @@ Tileset3DTileContent.fromJson = function (tileset, tile, resource, json) {
   const content = new Tileset3DTileContent(tileset, tile, resource);
   content._tileset.loadTileset(content._resource, json, content._tile);
   content._ready = true;
+
   return content;
 };
 
diff --git a/packages/engine/Source/Scene/Vector3DTileContent.js b/packages/engine/Source/Scene/Vector3DTileContent.js
index 396e1a9e52fb..565e8839aaa3 100644
--- a/packages/engine/Source/Scene/Vector3DTileContent.js
+++ b/packages/engine/Source/Scene/Vector3DTileContent.js
@@ -1,6 +1,7 @@
 import Cartesian3 from "../Core/Cartesian3.js";
 import defaultValue from "../Core/defaultValue.js";
 import defined from "../Core/defined.js";
+import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 import Ellipsoid from "../Core/Ellipsoid.js";
@@ -52,6 +53,13 @@ function Vector3DTileContent(tileset, tile, resource, arrayBuffer, byteOffset) {
   this._group = undefined;
 
   this._ready = false;
+
+  // This is here for backwards compatibility and can be removed when readyPromise is removed.
+  this._resolveContent = undefined;
+  this._readyPromise = new Promise((resolve) => {
+    this._resolveContent = resolve;
+  });
+
   initialize(this, arrayBuffer, byteOffset);
 }
 
@@ -120,12 +128,41 @@ Object.defineProperties(Vector3DTileContent.prototype, {
     },
   },
 
+  /**
+   * Returns true when the tile's content is ready to render; otherwise false
+   *
+   * @memberof Vector3DTileContent.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   * @private
+   */
   ready: {
     get: function () {
       return this._ready;
     },
   },
 
+  /**
+   * Gets the promise that will be resolved when the tile's content is ready to render.
+   *
+   * @memberof Vector3DTileContent.prototype
+   *
+   * @type {Promise<Vector3DTileContent>}
+   * @readonly
+   * @deprecated
+   * @private
+   */
+  readyPromise: {
+    get: function () {
+      deprecationWarning(
+        "Vector3DTileContent.readyPromise",
+        "Vector3DTileContent.readyPromise was deprecated in CesiumJS 1.104. It will be removed in 1.107. Wait for Vector3DTileContent.ready to return true instead."
+      );
+      return this._readyPromise;
+    },
+  },
+
   tileset: {
     get: function () {
       return this._tileset;
@@ -298,6 +335,7 @@ function initialize(content, arrayBuffer, byteOffset) {
 
   if (byteLength === 0) {
     content._ready = true;
+    content._resolveContent(content);
     return;
   }
 
@@ -714,6 +752,7 @@ Vector3DTileContent.prototype.update = function (tileset, frameState) {
     }
     this._batchTable.update(tileset, frameState);
     this._ready = true;
+    this._resolveContent(this);
   }
 };
 
diff --git a/packages/engine/Source/Scene/Vector3DTileGeometry.js b/packages/engine/Source/Scene/Vector3DTileGeometry.js
index 39ce487b1fc1..c6e4c7688079 100644
--- a/packages/engine/Source/Scene/Vector3DTileGeometry.js
+++ b/packages/engine/Source/Scene/Vector3DTileGeometry.js
@@ -108,6 +108,7 @@ Object.defineProperties(Vector3DTileGeometry.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   trianglesLength: {
     get: function () {
@@ -125,6 +126,7 @@ Object.defineProperties(Vector3DTileGeometry.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   geometryByteLength: {
     get: function () {
@@ -140,6 +142,7 @@ Object.defineProperties(Vector3DTileGeometry.prototype, {
    * @memberof Vector3DTileGeometry.prototype
    * @type {boolean}
    * @readonly
+   * @private
    */
   ready: {
     get: function () {
diff --git a/packages/engine/Source/Scene/Vector3DTilePoints.js b/packages/engine/Source/Scene/Vector3DTilePoints.js
index 42c65633d7f9..f66fc7901a01 100644
--- a/packages/engine/Source/Scene/Vector3DTilePoints.js
+++ b/packages/engine/Source/Scene/Vector3DTilePoints.js
@@ -67,6 +67,7 @@ Object.defineProperties(Vector3DTilePoints.prototype, {
    *
    * @type {boolean}
    * @readonly
+   * @private
    */
   ready: {
     get: function () {
@@ -81,6 +82,7 @@ Object.defineProperties(Vector3DTilePoints.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   pointsLength: {
     get: function () {
@@ -95,6 +97,7 @@ Object.defineProperties(Vector3DTilePoints.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   texturesByteLength: {
     get: function () {
diff --git a/packages/engine/Source/Scene/Vector3DTilePolygons.js b/packages/engine/Source/Scene/Vector3DTilePolygons.js
index dfc26848fe2b..06a6d3de907e 100644
--- a/packages/engine/Source/Scene/Vector3DTilePolygons.js
+++ b/packages/engine/Source/Scene/Vector3DTilePolygons.js
@@ -108,6 +108,7 @@ Object.defineProperties(Vector3DTilePolygons.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   trianglesLength: {
     get: function () {
@@ -125,6 +126,7 @@ Object.defineProperties(Vector3DTilePolygons.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   geometryByteLength: {
     get: function () {
@@ -140,6 +142,7 @@ Object.defineProperties(Vector3DTilePolygons.prototype, {
    * @memberof Vector3DTilePolygons.prototype
    * @type {boolean}
    * @readonly
+   * @private
    */
   ready: {
     get: function () {
diff --git a/packages/engine/Source/Scene/Vector3DTilePolylines.js b/packages/engine/Source/Scene/Vector3DTilePolylines.js
index 70baacb6d69c..781f568b5118 100644
--- a/packages/engine/Source/Scene/Vector3DTilePolylines.js
+++ b/packages/engine/Source/Scene/Vector3DTilePolylines.js
@@ -99,6 +99,7 @@ Object.defineProperties(Vector3DTilePolylines.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   trianglesLength: {
     get: function () {
@@ -113,6 +114,7 @@ Object.defineProperties(Vector3DTilePolylines.prototype, {
    *
    * @type {number}
    * @readonly
+   * @private
    */
   geometryByteLength: {
     get: function () {
@@ -125,6 +127,7 @@ Object.defineProperties(Vector3DTilePolylines.prototype, {
    * @memberof Vector3DTilePolylines.prototype
    * @type {boolean}
    * @readonly
+   * @private
    */
   ready: {
     get: function () {