diff --git a/indra/newview/llbottomtray.cpp b/indra/newview/llbottomtray.cpp
index 6ee438723656d303f24fa8ec8b50cb22ac399e03..ad5447bf33134ec7a629ee6221a04844e64fe238 100644
--- a/indra/newview/llbottomtray.cpp
+++ b/indra/newview/llbottomtray.cpp
@@ -48,10 +48,17 @@
 #include "llsyswellwindow.h"
 #include "lltoolmgr.h"
 #include "llviewerparcelmgr.h"
+// [RLVa:KB] - Checked: 2010-09-11 (RLVa-1.2.1d)
+#include "rlvhandler.h"
+#include "rlvui.h"
+// [/RLVa:KB]
 
 static void update_build_button_enable_state()
 {
-	bool can_edit = LLToolMgr::getInstance()->canEdit();
+//	bool can_edit = LLToolMgr::getInstance()->canEdit();
+// [RLVa:KB] - Checked: 2010-09-11 (RLVa-1.2.1d) | Added: RLVa-1.2.1d
+	bool can_edit = RlvUIEnabler::isBuildEnabled();
+// [/RLVa:KB]
 
 	LLBottomTray::getInstance()->getChildView("build_btn")->setEnabled(can_edit);
 }
diff --git a/indra/newview/lltoolmgr.cpp b/indra/newview/lltoolmgr.cpp
index 8f25ec4e9f765a1e018d5515327855bc08d2a173..f9b413410d4ec73f911a01aa402c7050784e4429 100644
--- a/indra/newview/lltoolmgr.cpp
+++ b/indra/newview/lltoolmgr.cpp
@@ -57,6 +57,7 @@
 #include "llviewerparcelmgr.h"
 // [RLVa:KB] - Checked: 2010-04-11 (RLVa-1.2.0e)
 #include "rlvhandler.h"
+#include "rlvui.h"
 // [/RLVa:KB]
 
 // Used when app not active to avoid processing hover.
@@ -82,7 +83,10 @@ LLToolMgr::LLToolMgr()
 {
 	// Not a panel, register these callbacks globally.
 	LLUICtrl::EnableCallbackRegistry::currentRegistrar().add("Build.Active", boost::bind(&LLToolMgr::inEdit, this));
-	LLUICtrl::EnableCallbackRegistry::currentRegistrar().add("Build.Enabled", boost::bind(&LLToolMgr::canEdit, this));
+//	LLUICtrl::EnableCallbackRegistry::currentRegistrar().add("Build.Enabled", boost::bind(&LLToolMgr::canEdit, this));
+// [RLVa:KB] - Checked: 2010-09-11 (RLVa-1.2.1d) | Added: RLVa-1.2.1d
+	LLUICtrl::EnableCallbackRegistry::currentRegistrar().add("Build.Enabled", boost::bind(&RlvUIEnabler::isBuildEnabled));
+// [/RLVa:KB]
 	LLUICtrl::CommitCallbackRegistry::currentRegistrar().add("Build.Toggle", boost::bind(&LLToolMgr::toggleBuildMode, this));
 	
 	gToolNull = new LLTool(LLStringUtil::null);  // Does nothing
diff --git a/indra/newview/rlvui.cpp b/indra/newview/rlvui.cpp
index 6d55b076eca0e5c316bdf8b0b553165459a40596..59c7a660e25249f5a210d8b385d961b44de657d2 100644
--- a/indra/newview/rlvui.cpp
+++ b/indra/newview/rlvui.cpp
@@ -65,6 +65,7 @@ RlvUIEnabler::RlvUIEnabler()
 	// onToggleXXX
 	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_EDIT, boost::bind(&RlvUIEnabler::onToggleEdit, this)));
 	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_FLY, boost::bind(&RlvUIEnabler::onToggleFly, this)));
+	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_REZ, boost::bind(&RlvUIEnabler::onToggleRez, this)));
 	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_SETENV, boost::bind(&RlvUIEnabler::onToggleSetEnv, this)));
 	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_SHOWINV, boost::bind(&RlvUIEnabler::onToggleShowInv, this)));
 	m_Handlers.insert(std::pair<ERlvBehaviour, behaviour_handler_t>(RLV_BHVR_SHOWLOC, boost::bind(&RlvUIEnabler::onToggleShowLoc, this)));
@@ -127,6 +128,9 @@ void RlvUIEnabler::onToggleEdit()
 			LLToolMgr::instance().toggleBuildMode();
 	}
 
+	// Enable/disable the "Build" bottom tray button (but only if edit *and* rez restricted)
+	LLBottomTray::getInstance()->getChild<LLButton>("build_btn")->setEnabled(isBuildEnabled());
+
 	// Start or stop filtering opening the beacons floater
 	if (!fEnable)
 		addGenericFloaterFilter("beacons");
@@ -147,6 +151,13 @@ void RlvUIEnabler::onToggleFly()
 	LLFloaterMove::sUpdateFlyingStatus();
 }
 
+// Checked: 2010-09-11 (RLVa-1.2.1d) | Added: RLVa-1.2.1d
+void RlvUIEnabler::onToggleRez()
+{
+	// Enable/disable the "Build" bottom tray button
+	LLBottomTray::getInstance()->getChild<LLButton>("build_btn")->setEnabled(isBuildEnabled());
+}
+
 // Checked: 2010-03-17 (RLVa-1.2.0a) | Added: RLVa-1.2.0a
 void RlvUIEnabler::onToggleSetEnv()
 {
@@ -597,4 +608,10 @@ bool RlvUIEnabler::hasOpenProfile(const LLUUID& idAgent)
 	return false;
 }
 
+// Checked: 2010-09-11 (RLVa-1.2.1d) | Added: RLVa-1.2.1d
+bool RlvUIEnabler::isBuildEnabled()
+{
+	return (!gRlvHandler.hasBehaviour(RLV_BHVR_EDIT) || !gRlvHandler.hasBehaviour(RLV_BHVR_REZ)) && LLToolMgr::getInstance()->canEdit();
+}
+
 // ============================================================================
diff --git a/indra/newview/rlvui.h b/indra/newview/rlvui.h
index 6c6a6a40eb2ebdba22854c7fccd143502d3e8891..8ac6ab3702e3c83a6b33d6fe6466486cead8256c 100644
--- a/indra/newview/rlvui.h
+++ b/indra/newview/rlvui.h
@@ -46,6 +46,7 @@ protected:
 	void onRefreshHoverText();											// showloc, shownames, showhovertext(all|world|hud)
 	void onToggleEdit();												// edit
 	void onToggleFly();													// fly
+	void onToggleRez();													// rez
 	void onToggleSetEnv();												// setenv
 	void onToggleShowInv();												// showinv
 	void onToggleShowLoc();												// showloc
@@ -92,6 +93,7 @@ public:
 	static bool canViewRegionProperties();								// showloc
 	static bool hasOpenIM(const LLUUID& idAgent);						// shownames
 	static bool hasOpenProfile(const LLUUID& idAgent);					// shownames
+	static bool isBuildEnabled();										// edit and rez
 
 	/*
 	 * Member variables