diff --git a/common/api/src/main/java/com/dfsek/terra/api/block/BlockData.java b/common/api/src/main/java/com/dfsek/terra/api/block/BlockData.java
new file mode 100644
index 000000000..c8c7e6f5d
--- /dev/null
+++ b/common/api/src/main/java/com/dfsek/terra/api/block/BlockData.java
@@ -0,0 +1,8 @@
+package com.dfsek.terra.api.block;
+
+import com.dfsek.terra.api.Handle;
+
+
+public interface BlockData extends Handle {
+    String toString();
+}
diff --git a/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockState.java b/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockState.java
index 2bcbd8a7a..440a29669 100644
--- a/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockState.java
+++ b/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockState.java
@@ -115,4 +115,12 @@ public interface BlockState extends Handle {
      * @return Whether this state is air
      */
     boolean isAir();
+
+    /**
+     * Get whether this BlockState is an extended state.
+     * Extended states are states that contain extra data not normally present in a BlockState.
+     *
+     * @return Whether this state is extended.
+     */
+    default boolean isExtended() { return false; }
 }
diff --git a/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockStateExtended.java b/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockStateExtended.java
new file mode 100644
index 000000000..c274736ab
--- /dev/null
+++ b/common/api/src/main/java/com/dfsek/terra/api/block/state/BlockStateExtended.java
@@ -0,0 +1,32 @@
+package com.dfsek.terra.api.block.state;
+
+import com.dfsek.terra.api.block.BlockData;
+
+
+public interface BlockStateExtended extends BlockState {
+    /**
+     * Sets the BlockData.
+     *
+     * @param data BlockData to set
+     *
+     * @return New BlockStateExtended with the given BlockData
+     */
+     BlockStateExtended setData(BlockData data);
+
+    /**
+     * Gets the BlockData.
+     *
+     * @return BlockData of this BlockStateExtended
+     */
+    BlockData getData();
+
+    /**
+     * Gets the BlockState.
+     *
+     * @return Raw BlockState of this BlockStateExtended
+     */
+    BlockState getState();
+
+    @Override
+    default boolean isExtended() {return true;}
+}