diff --git a/core/block_svg.js b/core/block_svg.js
index f441486db..f67179913 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -469,32 +469,30 @@ Blockly.BlockSvg.prototype.snapToGrid = function() {
  * Returns the coordinates of a bounding box describing the dimensions of this
  * block and any blocks stacked below it.
  * Coordinate system: workspace coordinates.
- * @return {!{topLeft: Blockly.utils.Coordinate, bottomRight: Blockly.utils.Coordinate}}
- *    Object with top left and bottom right coordinates of the bounding box.
+ * @return {!{top: number, bottom: number, left: number, right: number}}
+ *    Object with top, bottom, left, and right coordinates of the bounding box.
  */
 Blockly.BlockSvg.prototype.getBoundingRectangle = function() {
   var blockXY = this.getRelativeToSurfaceXY(this);
   var tab = this.outputConnection ? Blockly.BlockSvg.TAB_WIDTH : 0;
   var blockBounds = this.getHeightWidth();
-  var topLeft;
-  var bottomRight;
+  var top = blockXY.y;
+  var bottom = blockXY.y + blockBounds.height;
+  var left, right;
   if (this.RTL) {
     // Width has the tab built into it already so subtract it here.
-    topLeft = new Blockly.utils.Coordinate(
-        blockXY.x - (blockBounds.width - tab), blockXY.y);
+    left = blockXY.x - (blockBounds.width - tab);
     // Add the width of the tab/puzzle piece knob to the x coordinate
     // since X is the corner of the rectangle, not the whole puzzle piece.
-    bottomRight = new Blockly.utils.Coordinate(blockXY.x + tab,
-        blockXY.y + blockBounds.height);
+    right = blockXY.x + tab;
   } else {
     // Subtract the width of the tab/puzzle piece knob to the x coordinate
     // since X is the corner of the rectangle, not the whole puzzle piece.
-    topLeft = new Blockly.utils.Coordinate(blockXY.x - tab, blockXY.y);
+    left = blockXY.x - tab;
     // Width has the tab built into it already so subtract it here.
-    bottomRight = new Blockly.utils.Coordinate(
-        blockXY.x + blockBounds.width - tab, blockXY.y + blockBounds.height);
+    right = blockXY.x + blockBounds.width - tab;
   }
-  return {topLeft: topLeft, bottomRight: bottomRight};
+  return {top: top, bottom: bottom, left: left, right: right};
 };
 
 /**
diff --git a/core/inject.js b/core/inject.js
index 8ad0de9d0..93b1277fc 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -308,26 +308,26 @@ Blockly.createMainWorkspace_ = function(svg, options, blockDragSurface,
             var objectMetrics = object.getBoundingRectangle();
 
             // Bump any object that's above the top back inside.
-            var overflowTop = metrics.viewTop - objectMetrics.topLeft.y;
+            var overflowTop = metrics.viewTop - objectMetrics.top;
             if (overflowTop > 0) {
               object.moveBy(0, overflowTop);
             }
 
             // Bump any object that's below the bottom back inside.
             var overflowBottom =
-                metrics.viewBottom - objectMetrics.bottomRight.y;
+                metrics.viewBottom - objectMetrics.bottom;
             if (overflowBottom < 0) {
               object.moveBy(0, overflowBottom);
             }
 
             // Bump any object that's off the left back inside.
-            var overflowLeft = metrics.viewLeft - objectMetrics.topLeft.x;
+            var overflowLeft = metrics.viewLeft - objectMetrics.left;
             if (overflowLeft > 0) {
               object.moveBy(overflowLeft, 0);
             }
 
             // Bump any object that's off the right back inside.
-            var overflowRight = metrics.viewRight - objectMetrics.bottomRight.x;
+            var overflowRight = metrics.viewRight - objectMetrics.right;
             if (overflowRight < 0) {
               object.moveBy(overflowRight, 0);
             }
diff --git a/core/workspace_comment_svg.js b/core/workspace_comment_svg.js
index a8051e812..e8d8720da 100644
--- a/core/workspace_comment_svg.js
+++ b/core/workspace_comment_svg.js
@@ -419,30 +419,28 @@ Blockly.WorkspaceCommentSvg.prototype.clearTransformAttributes_ = function() {
  * Returns the coordinates of a bounding box describing the dimensions of this
  * comment.
  * Coordinate system: workspace coordinates.
- * @return {!{topLeft: Blockly.utils.Coordinate, bottomRight: Blockly.utils.Coordinate}}
- *    Object with top left and bottom right coordinates of the bounding box.
+ * @return {!{top: number, bottom: number, left: number, right: number}}
+ *    Object with top, bottom, left, and right coordinates of the bounding box.
  * @package
  */
 Blockly.WorkspaceCommentSvg.prototype.getBoundingRectangle = function() {
   var blockXY = this.getRelativeToSurfaceXY();
   var commentBounds = this.getHeightWidth();
-  var topLeft;
-  var bottomRight;
+  var top = blockXY.y;
+  var bottom = blockXY.y + commentBounds.height;
+  var left, right;
   if (this.RTL) {
-    topLeft = new Blockly.utils.Coordinate(blockXY.x - (commentBounds.width),
-        blockXY.y);
+    left = blockXY.x - (commentBounds.width);
     // Add the width of the tab/puzzle piece knob to the x coordinate
     // since X is the corner of the rectangle, not the whole puzzle piece.
-    bottomRight = new Blockly.utils.Coordinate(blockXY.x,
-        blockXY.y + commentBounds.height);
+    right = blockXY.x;
   } else {
     // Subtract the width of the tab/puzzle piece knob to the x coordinate
     // since X is the corner of the rectangle, not the whole puzzle piece.
-    topLeft = new Blockly.utils.Coordinate(blockXY.x, blockXY.y);
-    bottomRight = new Blockly.utils.Coordinate(blockXY.x + commentBounds.width,
-        blockXY.y + commentBounds.height);
+    left = blockXY.x;
+    right = blockXY.x + commentBounds.width;
   }
-  return {topLeft: topLeft, bottomRight: bottomRight};
+  return {top: top, bottom: bottom, left: left, right: right};
 };
 
 /**
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index 6c95a623d..b86e6a13c 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -1370,24 +1370,24 @@ Blockly.WorkspaceSvg.prototype.getBlocksBoundingBox = function() {
   // Start at 1 since the 0th block was used for initialization
   for (var i = 1; i < topElements.length; i++) {
     var blockBoundary = topElements[i].getBoundingRectangle();
-    if (blockBoundary.topLeft.x < boundary.topLeft.x) {
-      boundary.topLeft.x = blockBoundary.topLeft.x;
+    if (blockBoundary.left < boundary.left) {
+      boundary.left = blockBoundary.left;
     }
-    if (blockBoundary.bottomRight.x > boundary.bottomRight.x) {
-      boundary.bottomRight.x = blockBoundary.bottomRight.x;
+    if (blockBoundary.right > boundary.right) {
+      boundary.right = blockBoundary.right;
     }
-    if (blockBoundary.topLeft.y < boundary.topLeft.y) {
-      boundary.topLeft.y = blockBoundary.topLeft.y;
+    if (blockBoundary.top < boundary.top) {
+      boundary.top = blockBoundary.top;
     }
-    if (blockBoundary.bottomRight.y > boundary.bottomRight.y) {
-      boundary.bottomRight.y = blockBoundary.bottomRight.y;
+    if (blockBoundary.bottom > boundary.bottom) {
+      boundary.bottom = blockBoundary.bottom;
     }
   }
   return {
-    x: boundary.topLeft.x,
-    y: boundary.topLeft.y,
-    width: boundary.bottomRight.x - boundary.topLeft.x,
-    height: boundary.bottomRight.y - boundary.topLeft.y
+    x: boundary.left,
+    y: boundary.top,
+    width: boundary.right - boundary.left,
+    height: boundary.bottom - boundary.top
   };
 };