diff --git a/core/modules/block/block.module b/core/modules/block/block.module
index a08254a..3b46049 100644
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -111,10 +111,14 @@ function block_permission() {
 function block_menu() {
   $default_theme = Drupal::config('system.theme')->get('default');
   $items['admin/structure/block'] = array(
-    'title' => 'Blocks',
+    'title' => 'Block layout',
     'description' => 'Configure what block content appears in your site\'s sidebars and other regions.',
     'route_name' => 'block_admin_display',
   );
+  $items['admin/structure/block/list'] = array(
+    'title' => 'Blocks',
+    'type' => MENU_DEFAULT_LOCAL_TASK,
+  );
   $items['admin/structure/block/manage/%block'] = array(
     'title' => 'Configure block',
     'route_name' => 'block_admin_edit',
diff --git a/core/modules/block/custom_block/custom_block.info.yml b/core/modules/block/custom_block/custom_block.info.yml
index bde73f7..1ddf936 100644
--- a/core/modules/block/custom_block/custom_block.info.yml
+++ b/core/modules/block/custom_block/custom_block.info.yml
@@ -7,4 +7,4 @@ core: 8.x
 dependencies:
   - block
   - text
-configure: admin/structure/custom-blocks
+configure: admin/structure/block/custom-blocks
diff --git a/core/modules/block/custom_block/custom_block.module b/core/modules/block/custom_block/custom_block.module
index 725e3e7..4603f45 100644
--- a/core/modules/block/custom_block/custom_block.module
+++ b/core/modules/block/custom_block/custom_block.module
@@ -16,11 +16,11 @@ function custom_block_help($path, $arg) {
     case 'admin/help#custom_block':
       return t('Allows the creation of custom blocks through the user interface.');
 
-    case 'admin/structure/custom-blocks':
+    case 'admin/structure/block/custom-blocks':
       $output = '<p>' . t('This page lists user-created blocks. These blocks are derived from block types. A block type can consist of different fields and display settings. From the block types tab you can manage these fields as well as create new block types.') . '</p>';
       return $output;
 
-    case 'admin/structure/custom-blocks/types':
+    case 'admin/structure/block/custom-blocks/types':
       $output = '<p>' . t('This page lists block types. A block type can consist of different fields and display settings. From here you can manage these fields as well as create new block types.') . '</p>';
       return $output;
 
@@ -37,7 +37,7 @@ function custom_block_menu_local_tasks(&$data, $router_item, $root_path) {
     $item = menu_get_item('block/add');
     if ($item['access']) {
       // Add a destination parameter.
-      $item['localized_options']['query']['destination'] = 'admin/structure/custom-blocks';
+      $item['localized_options']['query']['destination'] = 'admin/structure/block/custom-blocks';
       $data['actions']['block/add'] = array(
         '#theme' => 'menu_local_action',
         '#link' => $item,
@@ -63,37 +63,38 @@ function custom_block_menu_local_actions_alter(&$actions) {
  * Implements hook_menu().
  */
 function custom_block_menu() {
-  $items['admin/structure/custom-blocks'] = array(
-    'title' => 'Custom blocks',
+  $items['admin/structure/block/custom-blocks'] = array(
+    'title' => 'Custom block library',
     'description' => 'Manage custom blocks.',
     'route_name' => 'custom_block_list',
+    'type' => MENU_LOCAL_TASK | MENU_NORMAL_ITEM,
   );
-  $items['admin/structure/custom-blocks/list'] = array(
+  $items['admin/structure/block/custom-blocks/list'] = array(
     'title' => 'Blocks',
     'type' => MENU_DEFAULT_LOCAL_TASK,
   );
-  $items['admin/structure/custom-blocks/types'] = array(
+  $items['admin/structure/block/custom-blocks/types'] = array(
     'title' => 'Types',
     'route_name' => 'custom_block_type_list',
     'type' => MENU_LOCAL_TASK,
   );
-  $items['admin/structure/custom-blocks/types/add'] = array(
+  $items['admin/structure/block/custom-blocks/types/add'] = array(
     'route_name' => 'custom_block_type_add',
     'type' => MENU_SIBLING_LOCAL_TASK,
     'weight' => 1,
   );
-  $items['admin/structure/custom-blocks/manage/%custom_block_type'] = array(
+  $items['admin/structure/block/custom-blocks/manage/%custom_block_type'] = array(
     'title' => 'Edit custom block type',
     'title callback' => 'entity_page_label',
     'title arguments' => array(4),
     'route_name' => 'custom_block_type_edit',
   );
-  $items['admin/structure/custom-blocks/manage/%custom_block_type/edit'] = array(
+  $items['admin/structure/block/custom-blocks/manage/%custom_block_type/edit'] = array(
     'title' => 'Edit',
     'type' => MENU_DEFAULT_LOCAL_TASK,
     'weight' => -10,
   );
-  $items['admin/structure/custom-blocks/manage/%custom_block_type/delete'] = array(
+  $items['admin/structure/block/custom-blocks/manage/%custom_block_type/delete'] = array(
     'title' => 'Delete',
     'type' => MENU_LOCAL_TASK,
     'weight' => 10,
@@ -251,7 +252,7 @@ function custom_block_admin_paths() {
     'block/add/*' => TRUE,
     'block/*' => TRUE,
     'block/*/delete' => TRUE,
-    'admin/structure/custom-blocks/*' => TRUE,
+    'admin/structure/block/custom-blocks/*' => TRUE,
   );
   return $paths;
 }
diff --git a/core/modules/block/custom_block/custom_block.routing.yml b/core/modules/block/custom_block/custom_block.routing.yml
index ac3cf6e..f3e7a79 100644
--- a/core/modules/block/custom_block/custom_block.routing.yml
+++ b/core/modules/block/custom_block/custom_block.routing.yml
@@ -1,5 +1,5 @@
 custom_block_type_list:
-  pattern: '/admin/structure/custom-blocks/types'
+  pattern: '/admin/structure/block/custom-blocks/types'
   defaults:
     _entity_list: 'custom_block_type'
   requirements:
@@ -20,7 +20,7 @@ custom_block_add_form:
     _permission: 'administer blocks'
 
 custom_block_type_delete:
-  pattern: '/admin/structure/custom-blocks/manage/{custom_block_type}/delete'
+  pattern: '/admin/structure/block/custom-blocks/manage/{custom_block_type}/delete'
   defaults:
     _entity_form: 'custom_block_type.delete'
   requirements:
@@ -42,21 +42,21 @@ custom_block_delete:
     _entity_access: 'custom_block.delete'
 
 custom_block_type_add:
-  pattern: '/admin/structure/custom-blocks/types/add'
+  pattern: '/admin/structure/block/custom-blocks/types/add'
   defaults:
     _entity_form: 'custom_block_type.add'
   requirements:
     _permission: 'administer blocks'
 
 custom_block_type_edit:
-  pattern: '/admin/structure/custom-blocks/manage/{custom_block_type}'
+  pattern: '/admin/structure/block/custom-blocks/manage/{custom_block_type}'
   defaults:
     _entity_form: 'custom_block_type.edit'
   requirements:
     _entity_access: 'custom_block_type.update'
 
 custom_block_list:
-  pattern: '/admin/structure/custom-blocks'
+  pattern: '/admin/structure/block/custom-blocks'
   defaults:
     _entity_list: 'custom_block'
   requirements:
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
index eb58dd6..d64e3de 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
@@ -191,7 +191,7 @@ public function save(array $form, array &$form_state) {
         }
       }
       else {
-        $form_state['redirect'] = 'admin/structure/custom-blocks';
+        $form_state['redirect'] = 'admin/structure/block/custom-blocks';
       }
     }
     else {
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockListController.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockListController.php
index 43d773f..efa31b3 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockListController.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockListController.php
@@ -40,7 +40,7 @@ public function getOperations(EntityInterface $entity) {
     if (isset($operations['edit'])) {
       $uri = $entity->uri();
       $operations['edit']['href'] = $uri['path'];
-      $operations['edit']['query']['destination'] = 'admin/structure/custom-blocks';
+      $operations['edit']['query']['destination'] = 'admin/structure/block/custom-blocks';
     }
     return $operations;
   }
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
index 06e92a5..a3e143f 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
@@ -101,7 +101,7 @@ public function save(array $form, array &$form_state) {
       watchdog('custom_block', 'Custom block type %label has been added.', array('%label' => $block_type->label()), WATCHDOG_NOTICE, l(t('Edit'), $uri['path'] . '/edit'));
     }
 
-    $form_state['redirect'] = 'admin/structure/custom-blocks/types';
+    $form_state['redirect'] = 'admin/structure/block/custom-blocks/types';
   }
 
   /**
@@ -109,7 +109,7 @@ public function save(array $form, array &$form_state) {
    */
   public function delete(array $form, array &$form_state) {
     $block_type = $this->entity;
-    $form_state['redirect'] = 'admin/structure/custom-blocks/manage/' . $block_type->id() . '/delete';
+    $form_state['redirect'] = 'admin/structure/block/custom-blocks/manage/' . $block_type->id() . '/delete';
   }
 
 }
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
index 698c39c..3493c86 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
@@ -36,7 +36,7 @@
  *   },
  *   base_table = "custom_block",
  *   revision_table = "custom_block_revision",
- *   route_base_path = "admin/structure/custom-blocks/manage/{bundle}",
+ *   route_base_path = "admin/structure/block/custom-blocks/manage/{bundle}",
  *   menu_base_path = "block/%custom_block",
  *   menu_edit_path = "block/%custom_block",
  *   fieldable = TRUE,
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlockType.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlockType.php
index b74c1d7..cb1a57e 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlockType.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlockType.php
@@ -82,7 +82,7 @@ class CustomBlockType extends ConfigEntityBase implements CustomBlockTypeInterfa
    */
   public function uri() {
     return array(
-      'path' => 'admin/structure/custom-blocks/manage/' . $this->id(),
+      'path' => 'admin/structure/block/custom-blocks/manage/' . $this->id(),
       'options' => array(
         'entity_type' => $this->entityType,
         'entity' => $this,
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockDeleteForm.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockDeleteForm.php
index 0cc6f05..6a1751b 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockDeleteForm.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockDeleteForm.php
@@ -59,7 +59,7 @@ public function submit(array $form, array &$form_state) {
     $this->entity->delete();
     drupal_set_message($this->t('Custom block %label has been deleted.', array('%label' => $this->entity->label())));
     watchdog('custom_block', 'Custom block %label has been deleted.', array('%label' => $this->entity->label()), WATCHDOG_NOTICE);
-    $form_state['redirect'] = 'admin/structure/custom-blocks';
+    $form_state['redirect'] = 'admin/structure/block/custom-blocks';
   }
 
 }
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockTypeDeleteForm.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockTypeDeleteForm.php
index eac3ab6..b21d556 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockTypeDeleteForm.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Form/CustomBlockTypeDeleteForm.php
@@ -53,7 +53,7 @@ public function getQuestion() {
    * {@inheritdoc}
    */
   public function getCancelPath() {
-    return 'admin/structure/custom-blocks/types';
+    return 'admin/structure/block/custom-blocks/types';
   }
 
   /**
@@ -83,7 +83,7 @@ public function buildForm(array $form, array &$form_state) {
    */
   public function submit(array $form, array &$form_state) {
     $this->entity->delete();
-    $form_state['redirect'] = 'admin/structure/custom-blocks/types';
+    $form_state['redirect'] = 'admin/structure/block/custom-blocks/types';
     drupal_set_message(t('Custom block type %label has been deleted.', array('%label' => $this->entity->label())));
     watchdog('custom_block', 'Custom block type %label has been deleted.', array('%label' => $this->entity->label()), WATCHDOG_NOTICE);
   }
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockListTest.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockListTest.php
index 438b4f9..698157a 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockListTest.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockListTest.php
@@ -37,7 +37,7 @@ public static function getInfo() {
    */
   public function testListing() {
     $this->drupalLogin($this->drupalCreateUser(array('administer blocks')));
-    $this->drupalGet('admin/structure/custom-blocks');
+    $this->drupalGet('admin/structure/block/custom-blocks');
 
     // Test for the page title.
     $this->assertTitle(t('Custom blocks') . ' | Drupal');
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockTypeTest.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockTypeTest.php
index d5322e1..8c8e44b 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockTypeTest.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Tests/CustomBlockTypeTest.php
@@ -61,7 +61,7 @@ public function testCustomBlockTypeCreation() {
       'id' => 'foo',
       'label' => 'title for foo',
     );
-    $this->drupalPost('admin/structure/custom-blocks/types/add', $edit, t('Save'));
+    $this->drupalPost('admin/structure/block/custom-blocks/types/add', $edit, t('Save'));
     $block_type = entity_load('custom_block_type', 'foo');
     $this->assertTrue($block_type, 'The new block type has been created.');
 
@@ -90,7 +90,7 @@ public function testCustomBlockTypeEditing() {
     $edit = array(
       'label' => 'Bar',
     );
-    $this->drupalPost('admin/structure/custom-blocks/manage/basic', $edit, t('Save'));
+    $this->drupalPost('admin/structure/block/custom-blocks/manage/basic', $edit, t('Save'));
     field_info_cache_clear();
 
     $this->drupalGet('block/add');
@@ -99,9 +99,9 @@ public function testCustomBlockTypeEditing() {
     $this->assertEqual(url('block/add/basic', array('absolute' => TRUE)), $this->getUrl(), 'Original machine name was used in URL.');
 
     // Remove the body field.
-    $this->drupalPost('admin/structure/custom-blocks/manage/basic/fields/custom_block.basic.block_body/delete', array(), t('Delete'));
+    $this->drupalPost('admin/structure/block/custom-blocks/manage/basic/fields/custom_block.basic.block_body/delete', array(), t('Delete'));
     // Resave the settings for this type.
-    $this->drupalPost('admin/structure/custom-blocks/manage/basic', array(), t('Save'));
+    $this->drupalPost('admin/structure/block/custom-blocks/manage/basic', array(), t('Save'));
     // Check that the body field doesn't exist.
     $this->drupalGet('block/add/basic');
     $this->assertNoRaw('Block body', 'Body field was not found.');
@@ -119,7 +119,7 @@ public function testCustomBlockTypeDeletion() {
     // Add a new block of this type.
     $block = $this->createCustomBlock(FALSE, 'foo');
     // Attempt to delete the block type, which should not be allowed.
-    $this->drupalGet('admin/structure/custom-blocks/manage/' . $type->id() . '/delete');
+    $this->drupalGet('admin/structure/block/custom-blocks/manage/' . $type->id() . '/delete');
     $this->assertRaw(
       t('%label is used by 1 custom block on your site. You can not remove this block type until you have removed all of the %label blocks.', array('%label' => $type->label())),
       'The block type will not be deleted until all blocks of that type are removed.'
@@ -129,7 +129,7 @@ public function testCustomBlockTypeDeletion() {
     // Delete the block.
     $block->delete();
     // Attempt to delete the block type, which should now be allowed.
-    $this->drupalGet('admin/structure/custom-blocks/manage/' . $type->id() . '/delete');
+    $this->drupalGet('admin/structure/block/custom-blocks/manage/' . $type->id() . '/delete');
     $this->assertRaw(
       t('Are you sure you want to delete %type?', array('%type' => $type->id())),
       'The block type is available for deletion.'
@@ -173,7 +173,7 @@ public function testsCustomBlockAddTypes() {
 
     // Test that adding a block from the 'custom blocks list' doesn't send you
     // to the block configure form.
-    $this->drupalGet('admin/structure/custom-blocks');
+    $this->drupalGet('admin/structure/block/custom-blocks');
     $this->clickLink(t('Add custom block'));
     $this->clickLink('foo');
     $edit = array('info' => $this->randomName(8));
@@ -182,7 +182,7 @@ public function testsCustomBlockAddTypes() {
     if (!empty($blocks)) {
       $block = reset($blocks);
       $destination = 'admin/structure/block/add/custom_block:' . $block->uuid() . '/' . $theme;
-      $this->assertUrl(url('admin/structure/custom-blocks', array(
+      $this->assertUrl(url('admin/structure/block/custom-blocks', array(
         'absolute' => TRUE
       )));
     }