diff --git a/LEGO1/lego/legoomni/include/elevatorbottom.h b/LEGO1/lego/legoomni/include/elevatorbottom.h
index 64b3f221..e10b7727 100644
--- a/LEGO1/lego/legoomni/include/elevatorbottom.h
+++ b/LEGO1/lego/legoomni/include/elevatorbottom.h
@@ -1,9 +1,11 @@
 #ifndef ELEVATORBOTTOM_H
 #define ELEVATORBOTTOM_H
 
+#include "decomp.h"
 #include "legoworld.h"
 
 // VTABLE: LEGO1 0x100d5f20
+// SIZE: 0xfc (from inlined ctor at 0x1000a8aa)
 class ElevatorBottom : public LegoWorld {
 public:
 	ElevatorBottom();
@@ -23,6 +25,9 @@ class ElevatorBottom : public LegoWorld {
 	{
 		return !strcmp(p_name, ElevatorBottom::ClassName()) || LegoWorld::IsA(p_name);
 	}
+
+private:
+	undefined4 m_unk0xf8; // 0xf8
 };
 
 #endif // ELEVATORBOTTOM_H
diff --git a/LEGO1/lego/legoomni/src/infocenter/elevatorbottom.cpp b/LEGO1/lego/legoomni/src/infocenter/elevatorbottom.cpp
index 247defb0..2b6ec2b6 100644
--- a/LEGO1/lego/legoomni/src/infocenter/elevatorbottom.cpp
+++ b/LEGO1/lego/legoomni/src/infocenter/elevatorbottom.cpp
@@ -1,9 +1,15 @@
 #include "elevatorbottom.h"
 
-// STUB: LEGO1 0x10017e90
+DECOMP_SIZE_ASSERT(ElevatorBottom, 0xfc)
+
+#include "mxnotificationmanager.h"
+#include "mxomni.h"
+
+// FUNCTION: LEGO1 0x10017e90
 ElevatorBottom::ElevatorBottom()
 {
-	// TODO
+	NotificationManager()->Register(this);
+	this->m_unk0xf8 = 0;
 }
 
 // STUB: LEGO1 0x10018060