diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorCategoryBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorCategoryBlock.php
index 10bc52e034b..acf85200194 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorCategoryBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorCategoryBlock.php
@@ -62,9 +62,9 @@ class AggregatorCategoryBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $id = $this->getPluginId();
     if ($category = db_query('SELECT cid, title, block FROM {aggregator_category} WHERE cid = :cid', array(':cid' => $id))->fetchObject()) {
       $result = db_query_range('SELECT i.* FROM {aggregator_category_item} ci LEFT JOIN {aggregator_item} i ON ci.iid = i.iid WHERE ci.cid = :cid ORDER BY i.timestamp DESC, i.iid DESC', 0, $this->configuration['block_count'], array(':cid' => $category->cid));
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorFeedBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorFeedBlock.php
index afcef0e815f..335c3700539 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorFeedBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/block/block/AggregatorFeedBlock.php
@@ -62,9 +62,9 @@ class AggregatorFeedBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     // Plugin IDs look something like this: aggregator_feed_block:1.
     list(, $id) = explode(':', $this->getPluginId());
     if ($feed = db_query('SELECT fid, title, block FROM {aggregator_feed} WHERE block <> 0 AND fid = :fid', array(':fid' => $id))->fetchObject()) {
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/block/block/CustomBlockBlock.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/block/block/CustomBlockBlock.php
index 9219264f310..ab8c65e8651 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/block/block/CustomBlockBlock.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Plugin/block/block/CustomBlockBlock.php
@@ -73,9 +73,9 @@ class CustomBlockBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     // @todo Clean up when http://drupal.org/node/1874498 lands.
     list(, $uuid) = explode(':', $this->getPluginId());
     if ($block = entity_load_by_uuid('custom_block', $uuid)) {
diff --git a/core/modules/block/lib/Drupal/block/BlockBase.php b/core/modules/block/lib/Drupal/block/BlockBase.php
index 4de2a59add5..0909345e805 100644
--- a/core/modules/block/lib/Drupal/block/BlockBase.php
+++ b/core/modules/block/lib/Drupal/block/BlockBase.php
@@ -496,4 +496,21 @@ abstract class BlockBase extends PluginBase implements BlockInterface {
    */
   public function blockSubmit($form, &$form_state) {}
 
+  /**
+   * Implements \Drupal\block\BlockInterface::build().
+   */
+  public function build() {
+    // @todo Move block rendering code common to all blocks from
+    //   BlockRenderController to here: http://drupal.org/node/1927608.
+    return $this->blockBuild();
+  }
+
+  /**
+   * Adds block-type-specific render handling for the block plugin.
+   *
+   * @return array
+   *   A renderable array representing the content of this block.
+   */
+  abstract protected function blockBuild();
+
 }
diff --git a/core/modules/block/tests/lib/Drupal/block_test/Plugin/block/block/TestCacheBlock.php b/core/modules/block/tests/lib/Drupal/block_test/Plugin/block/block/TestCacheBlock.php
index dd7a4233c84..14dfd9d6907 100644
--- a/core/modules/block/tests/lib/Drupal/block_test/Plugin/block/block/TestCacheBlock.php
+++ b/core/modules/block/tests/lib/Drupal/block_test/Plugin/block/block/TestCacheBlock.php
@@ -34,9 +34,9 @@ class TestCacheBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       '#children' => state()->get('block_test.content'),
     );
diff --git a/core/modules/book/lib/Drupal/book/Plugin/block/block/BookNavigationBlock.php b/core/modules/book/lib/Drupal/book/Plugin/block/block/BookNavigationBlock.php
index 165c798fe78..e3b8162fee4 100644
--- a/core/modules/book/lib/Drupal/book/Plugin/block/block/BookNavigationBlock.php
+++ b/core/modules/book/lib/Drupal/book/Plugin/block/block/BookNavigationBlock.php
@@ -59,9 +59,9 @@ class BookNavigationBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $current_bid = 0;
     if ($node = menu_get_object()) {
       $current_bid = empty($node->book['bid']) ? 0 : $node->book['bid'];
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/block/block/RecentCommentsBlock.php b/core/modules/comment/lib/Drupal/comment/Plugin/block/block/RecentCommentsBlock.php
index bd7b49b0fde..a55c8e17847 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/block/block/RecentCommentsBlock.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/block/block/RecentCommentsBlock.php
@@ -59,9 +59,9 @@ class RecentCommentsBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       '#theme' => 'comment_block',
       '#number' => $this->configuration['block_count'],
diff --git a/core/modules/forum/lib/Drupal/forum/Plugin/block/block/ActiveTopicsBlock.php b/core/modules/forum/lib/Drupal/forum/Plugin/block/block/ActiveTopicsBlock.php
index e3ff7dd0852..c4fab8cb87b 100644
--- a/core/modules/forum/lib/Drupal/forum/Plugin/block/block/ActiveTopicsBlock.php
+++ b/core/modules/forum/lib/Drupal/forum/Plugin/block/block/ActiveTopicsBlock.php
@@ -22,9 +22,9 @@ use Drupal\Core\Annotation\Translation;
 class ActiveTopicsBlock extends ForumBlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $query = db_select('forum_index', 'f')
       ->fields('f')
       ->addTag('node_access')
diff --git a/core/modules/forum/lib/Drupal/forum/Plugin/block/block/NewTopicsBlock.php b/core/modules/forum/lib/Drupal/forum/Plugin/block/block/NewTopicsBlock.php
index 71d4c3b0153..1ef73118d8e 100644
--- a/core/modules/forum/lib/Drupal/forum/Plugin/block/block/NewTopicsBlock.php
+++ b/core/modules/forum/lib/Drupal/forum/Plugin/block/block/NewTopicsBlock.php
@@ -22,9 +22,9 @@ use Drupal\Core\Annotation\Translation;
 class NewTopicsBlock extends ForumBlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $query = db_select('forum_index', 'f')
       ->fields('f')
       ->addTag('node_access')
diff --git a/core/modules/language/lib/Drupal/language/Plugin/block/block/LanguageBlock.php b/core/modules/language/lib/Drupal/language/Plugin/block/block/LanguageBlock.php
index 53c58e7f47a..efe4b7980a4 100644
--- a/core/modules/language/lib/Drupal/language/Plugin/block/block/LanguageBlock.php
+++ b/core/modules/language/lib/Drupal/language/Plugin/block/block/LanguageBlock.php
@@ -31,9 +31,9 @@ class LanguageBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $build = array();
     $path = drupal_is_front_page() ? '<front>' : current_path();
     list($plugin_id, $type) = explode(':', $this->getPluginId());
diff --git a/core/modules/menu/lib/Drupal/menu/Plugin/block/block/MenuBlock.php b/core/modules/menu/lib/Drupal/menu/Plugin/block/block/MenuBlock.php
index c535fc60a73..2044087705e 100644
--- a/core/modules/menu/lib/Drupal/menu/Plugin/block/block/MenuBlock.php
+++ b/core/modules/menu/lib/Drupal/menu/Plugin/block/block/MenuBlock.php
@@ -24,9 +24,9 @@ use Drupal\Core\Annotation\Translation;
 class MenuBlock extends SystemMenuBlock {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     list($plugin, $menu) = explode(':', $this->getPluginId());
     return menu_tree($menu);
   }
diff --git a/core/modules/node/lib/Drupal/node/Plugin/block/block/RecentContentBlock.php b/core/modules/node/lib/Drupal/node/Plugin/block/block/RecentContentBlock.php
index 083a0960c90..10644617fe4 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/block/block/RecentContentBlock.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/block/block/RecentContentBlock.php
@@ -59,9 +59,9 @@ class RecentContentBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     if ($nodes = node_get_recent($this->configuration['block_count'])) {
       return array(
         '#theme' => 'node_recent_block',
diff --git a/core/modules/node/lib/Drupal/node/Plugin/block/block/SyndicateBlock.php b/core/modules/node/lib/Drupal/node/Plugin/block/block/SyndicateBlock.php
index af627a23f9a..49d0eb4df4c 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/block/block/SyndicateBlock.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/block/block/SyndicateBlock.php
@@ -39,9 +39,9 @@ class SyndicateBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       '#theme' => 'feed_icon',
       '#url' => 'rss.xml',
diff --git a/core/modules/search/lib/Drupal/search/Plugin/block/block/SearchBlock.php b/core/modules/search/lib/Drupal/search/Plugin/block/block/SearchBlock.php
index bb06d352606..10760215554 100644
--- a/core/modules/search/lib/Drupal/search/Plugin/block/block/SearchBlock.php
+++ b/core/modules/search/lib/Drupal/search/Plugin/block/block/SearchBlock.php
@@ -30,9 +30,9 @@ class SearchBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(drupal_get_form('search_block_form'));
   }
 
diff --git a/core/modules/shortcut/lib/Drupal/shortcut/Plugin/block/block/ShortcutsBlock.php b/core/modules/shortcut/lib/Drupal/shortcut/Plugin/block/block/ShortcutsBlock.php
index f6107170fb6..7a56d761df9 100644
--- a/core/modules/shortcut/lib/Drupal/shortcut/Plugin/block/block/ShortcutsBlock.php
+++ b/core/modules/shortcut/lib/Drupal/shortcut/Plugin/block/block/ShortcutsBlock.php
@@ -23,9 +23,9 @@ use Drupal\Core\Annotation\Translation;
 class ShortcutsBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       shortcut_renderable_links(shortcut_current_displayed_set()),
     );
diff --git a/core/modules/statistics/lib/Drupal/statistics/Plugin/block/block/StatisticsPopularBlock.php b/core/modules/statistics/lib/Drupal/statistics/Plugin/block/block/StatisticsPopularBlock.php
index 7417bd88914..9a740acd539 100644
--- a/core/modules/statistics/lib/Drupal/statistics/Plugin/block/block/StatisticsPopularBlock.php
+++ b/core/modules/statistics/lib/Drupal/statistics/Plugin/block/block/StatisticsPopularBlock.php
@@ -116,9 +116,9 @@ class StatisticsPopularBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $content = array();
 
     if ($this->day_list) {
diff --git a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemHelpBlock.php b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemHelpBlock.php
index a5476c33e7b..140b0920c29 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemHelpBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemHelpBlock.php
@@ -38,9 +38,9 @@ class SystemHelpBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       '#children' => $this->help,
     );
diff --git a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMainBlock.php b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMainBlock.php
index 80510b09b9f..89e3a9cd938 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMainBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMainBlock.php
@@ -23,9 +23,9 @@ use Drupal\Core\Annotation\Translation;
 class SystemMainBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       drupal_set_page_content()
     );
diff --git a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMenuBlock.php b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMenuBlock.php
index 01aa4706301..8a2e11f5a09 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMenuBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMenuBlock.php
@@ -33,9 +33,9 @@ class SystemMenuBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     list($plugin, $derivative) = explode(':', $this->getPluginId());
     // Derivatives are prefixed with 'menu-'.
     $menu = substr($derivative, 5);
diff --git a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemPoweredByBlock.php b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemPoweredByBlock.php
index 958edc08a15..9e29c1e1812 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemPoweredByBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/block/block/SystemPoweredByBlock.php
@@ -23,9 +23,9 @@ use Drupal\Core\Annotation\Translation;
 class SystemPoweredByBlock extends BlockBase {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     return array(
       '#children' => theme('system_powered_by'),
     );
diff --git a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserLoginBlock.php b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserLoginBlock.php
index 716a315a69d..4d57119c5b6 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserLoginBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserLoginBlock.php
@@ -30,9 +30,9 @@ class UserLoginBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $form = drupal_get_form('user_login_form');
     unset($form['name']['#attributes']['autofocus']);
     unset($form['name']['#description']);
diff --git a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserNewBlock.php b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserNewBlock.php
index 5f88f7fa7bc..b32714adcdc 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserNewBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserNewBlock.php
@@ -62,9 +62,9 @@ class UserNewBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     // Retrieve a list of new users who have accessed the site successfully.
     $items = db_query_range('SELECT uid, name FROM {users} WHERE status <> 0 AND access <> 0 ORDER BY created DESC', 0, $this->configuration['whois_new_count'])->fetchAll();
     $build = array(
diff --git a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserOnlineBlock.php b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserOnlineBlock.php
index d88568acbe1..65dbe222b04 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/block/block/UserOnlineBlock.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/block/block/UserOnlineBlock.php
@@ -76,9 +76,9 @@ class UserOnlineBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     // Count users active within the defined period.
     $interval = REQUEST_TIME - $this->configuration['seconds_online'];
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsBlock.php b/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsBlock.php
index 8a77f18ee3b..6b87904d290 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsBlock.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsBlock.php
@@ -71,9 +71,9 @@ class ViewsBlock extends BlockBase {
   }
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $output = $this->view->executeDisplay($this->displayID);
     // Set the label to the title configured in the view.
     $this->entity->set('label', filter_xss_admin($this->view->getTitle()));
diff --git a/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsExposedFilterBlock.php b/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsExposedFilterBlock.php
index cb9d37c525a..97037bbd6cf 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsExposedFilterBlock.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/block/block/ViewsExposedFilterBlock.php
@@ -23,9 +23,9 @@ use Drupal\Core\Annotation\Translation;
 class ViewsExposedFilterBlock extends ViewsBlock {
 
   /**
-   * Implements \Drupal\block\BlockBase::build().
+   * Implements \Drupal\block\BlockBase::blockBuild().
    */
-  public function build() {
+  protected function blockBuild() {
     $output = $this->view->display_handler->viewExposedFormBlocks();
     // Before returning the block output, convert it to a renderable array with
     // contextual links.