Index: binaries/data/mods/public/simulation/components/BuildRestrictions.js
===================================================================
--- binaries/data/mods/public/simulation/components/BuildRestrictions.js
+++ binaries/data/mods/public/simulation/components/BuildRestrictions.js
@@ -17,7 +17,8 @@
 		"<choice>" +
 			"<value>land</value>" +
 			"<value>shore</value>" +
-			"<value>land-shore</value>"+
+			"<value>land-shore</value>" +
+			"<value>socket</value>" +
 		"</choice>" +
 	"</element>" +
 	"<element name='Territory' a:help='Specifies territory type restrictions for this building.'>" +
@@ -45,11 +46,18 @@
 				"<optional><element name='MaxDistance'><data type='positiveInteger'/></element></optional>" +
 			"</interleave>" +
 		"</element>" +
+	"</optional>" +
+	"<optional>" +
+		"<element name='Socket' a:help='Specifies the socket template this building needs to be placed upon.'>" +
+			"<text/>" +
+		"</element>" +
 	"</optional>";
 
 BuildRestrictions.prototype.Init = function()
 {
 	this.territories = this.template.Territory.split(/\s+/);
+	if (this.template.PlacementType == "socket" && !this.template.Socket)
+		warn("Placement type 'Socket' without a socket specified, this building cannot be built.");
 };
 
 /**
@@ -124,6 +132,10 @@
 		passClassName = "default-terrain-only";
 		break;
 
+	case "socket":
+		passClassName = "socket";
+		break;
+
 	case "land":
 	default:
 		passClassName = "building-land";
@@ -133,15 +145,20 @@
 	if (!cmpObstruction)
 		return result; // Fail
 
-
+	let ret;
 	if (this.template.Category == "Wall")
 	{
 		// for walls, only test the center point
-		var ret = cmpObstruction.CheckFoundation(passClassName, true);
+		ret = cmpObstruction.CheckFoundation(passClassName, true);
+	}
+	else if (passClassName == "socket")
+	{
+//		ret = cmpObstruction.CheckFoundation(passClassName, false, this.template.Socket);
+//return result;
 	}
 	else
 	{
-		var ret = cmpObstruction.CheckFoundation(passClassName, false);
+		ret = cmpObstruction.CheckFoundation(passClassName, false);
 	}
 
 	if (ret != "success")
@@ -155,6 +172,10 @@
 		case "fail_obstructs_foundation":
 			result.message = markForTranslation("%(name)s cannot be built on another building or resource");
 			break;
+		case "fail_no_socket":
+			// ToDo: Send the name of the socket where this building ought to be build upon.
+			result.message = markForTranslation("%(name)s can only be built on a specific socket");
+			break;
 		case "fail_terrain_class":
 			// TODO: be more specific and/or list valid terrain?
 			result.message = markForTranslation("%(name)s cannot be built on invalid terrain");
Index: binaries/data/mods/public/simulation/components/BuildSlot.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/components/BuildSlot.js
@@ -0,0 +1,44 @@
+function BuildSlot() {}
+
+BuildSlot.prototype.Schema =
+	"<a:help>Specifies this is a building slot, a entity where a building can be placed upon.</a:help>" +
+	"<a:example>" +
+		"<BuildSlot>" +
+			"<HideUponConstruction>true</HideUponConstruction>" +
+		"</BuildSlot>" +
+	"</a:example>" +
+	"<element name='HideUponConstruction' a:help='Whether the slot will be hidden when the construction initiates.'>" +
+		"<data type='boolean'/>" +
+	"</element>";
+
+BuildSlot.prototype.Init = function()
+{
+};
+
+BuildSlot.prototype.InitConstruction = function()
+{
+	if (this.template.HideUponConstruction != "true")
+		return true;
+
+	let cmpPosition = Engine.QueryInterface(this.entity, IID_Position);
+	if (!cmpPosition)
+		return false;
+
+	this.previousPosition = cmpPosition.GetPosition();
+	cmpPosition.MoveOutOfWorld();
+
+	return true;
+};
+
+BuildSlot.prototype.Reset = function()
+{
+	if (!this.previousPosition)
+		return;
+
+	let cmpPosition = Engine.QueryInterface(this.entity, IID_Position);
+	if (!cmpPosition)
+		return;
+
+	cmpPosition.JumpTo(this.previousPosition.x, this.previousPosition.z);
+	delete this.previousPosition;
+};
Index: binaries/data/mods/public/simulation/components/interfaces/BuildSlot.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/components/interfaces/BuildSlot.js
@@ -0,0 +1 @@
+Engine.RegisterInterface("BuildSlot");
Index: binaries/data/mods/public/simulation/templates/template_formation.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_formation.xml
+++ binaries/data/mods/public/simulation/templates/template_formation.xml
@@ -43,6 +43,7 @@
     <BlockPathfinding>false</BlockPathfinding>
     <BlockFoundation>false</BlockFoundation>
     <BlockConstruction>false</BlockConstruction>
+    <IsSocket>false</IsSocket>
     <DisableBlockMovement>false</DisableBlockMovement>
     <DisableBlockPathfinding>false</DisableBlockPathfinding>
     <DeleteUponConstruction>false</DeleteUponConstruction>
Index: binaries/data/mods/public/simulation/templates/template_gaia.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_gaia.xml
+++ binaries/data/mods/public/simulation/templates/template_gaia.xml
@@ -13,6 +13,7 @@
     <BlockPathfinding>true</BlockPathfinding>
     <BlockFoundation>true</BlockFoundation>
     <BlockConstruction>true</BlockConstruction>
+    <IsSocket>false</IsSocket>
     <DisableBlockMovement>false</DisableBlockMovement>
     <DisableBlockPathfinding>false</DisableBlockPathfinding>
     <DeleteUponConstruction>false</DeleteUponConstruction>
Index: binaries/data/mods/public/simulation/templates/template_structure.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure.xml
+++ binaries/data/mods/public/simulation/templates/template_structure.xml
@@ -79,6 +79,7 @@
     <BlockPathfinding>true</BlockPathfinding>
     <BlockFoundation>true</BlockFoundation>
     <BlockConstruction>false</BlockConstruction>
+    <IsSocket>false</IsSocket>
     <DisableBlockMovement>false</DisableBlockMovement>
     <DisableBlockPathfinding>false</DisableBlockPathfinding>
     <DeleteUponConstruction>false</DeleteUponConstruction>
Index: binaries/data/mods/public/simulation/templates/template_structure_civic_house.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure_civic_house.xml
+++ binaries/data/mods/public/simulation/templates/template_structure_civic_house.xml
@@ -2,6 +2,8 @@
 <Entity parent="template_structure_civic">
   <BuildRestrictions>
     <Category>House</Category>
+    <PlacementType>socket</PlacementType>
+    <Socket>template_socket_house</Socket>
   </BuildRestrictions>
   <Capturable>
     <CapturePoints>300</CapturePoints>
Index: binaries/data/mods/public/simulation/templates/template_unit.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit.xml
+++ binaries/data/mods/public/simulation/templates/template_unit.xml
@@ -65,6 +65,7 @@
     <BlockPathfinding>false</BlockPathfinding>
     <BlockFoundation>false</BlockFoundation>
     <BlockConstruction>true</BlockConstruction>
+    <IsSocket>false</IsSocket>
     <DisableBlockMovement>false</DisableBlockMovement>
     <DisableBlockPathfinding>false</DisableBlockPathfinding>
     <DeleteUponConstruction>false</DeleteUponConstruction>
Index: source/simulation2/components/CCmpObstruction.cpp
===================================================================
--- source/simulation2/components/CCmpObstruction.cpp
+++ source/simulation2/components/CCmpObstruction.cpp
@@ -164,6 +164,9 @@
 			"<element name='BlockConstruction' a:help='Whether players should be unable to begin constructing buildings placed on top of this entity'>"
 				"<data type='boolean'/>"
 			"</element>"
+			"<element name='IsSocket' a:help='If true, this is a socket, a place where a building must be placed within.'>"
+				"<data type='boolean'/>"
+			"</element>"
 			"<element name='DeleteUponConstruction' a:help='Whether this entity should be deleted when construction on a buildings placed on top of this entity is started.'>"
 				"<data type='boolean'/>"
 			"</element>"
@@ -196,6 +199,8 @@
 			m_TemplateFlags |= ICmpObstructionManager::FLAG_BLOCK_CONSTRUCTION;
 		if (paramNode.GetChild("DeleteUponConstruction").ToBool())
 			m_TemplateFlags |= ICmpObstructionManager::FLAG_DELETE_UPON_CONSTRUCTION;
+		if (paramNode.GetChild("IsSocket").ToBool())
+			m_TemplateFlags |= ICmpObstructionManager::FLAG_IS_SOCKET;
 
 		m_Flags = m_TemplateFlags;
 		if (paramNode.GetChild("DisableBlockMovement").ToBool())
Index: source/simulation2/components/ICmpObstruction.h
===================================================================
--- source/simulation2/components/ICmpObstruction.h
+++ source/simulation2/components/ICmpObstruction.h
@@ -35,6 +35,7 @@
 		FOUNDATION_CHECK_FAIL_ERROR,
 		FOUNDATION_CHECK_FAIL_NO_OBSTRUCTION,
 		FOUNDATION_CHECK_FAIL_OBSTRUCTS_FOUNDATION,
+		FOUNDATION_CHECK_FAIL_NO_SOCKET,
 		FOUNDATION_CHECK_FAIL_TERRAIN_CLASS
 	};
 
Index: source/simulation2/components/ICmpObstruction.cpp
===================================================================
--- source/simulation2/components/ICmpObstruction.cpp
+++ source/simulation2/components/ICmpObstruction.cpp
@@ -37,6 +37,8 @@
 		return "fail_no_obstruction";
 	case FOUNDATION_CHECK_FAIL_OBSTRUCTS_FOUNDATION:
 		return "fail_obstructs_foundation";
+	case FOUNDATION_CHECK_FAIL_NO_SOCKET:
+		return "fail_no_socket";
 	case FOUNDATION_CHECK_FAIL_TERRAIN_CLASS:
 		return "fail_terrain_class";
 	default:
Index: source/simulation2/components/ICmpObstructionManager.h
===================================================================
--- source/simulation2/components/ICmpObstructionManager.h
+++ source/simulation2/components/ICmpObstructionManager.h
@@ -86,7 +86,8 @@
 		FLAG_BLOCK_CONSTRUCTION       = (1 << 2), // prevents buildings being constructed on this shape
 		FLAG_BLOCK_PATHFINDING        = (1 << 3), // prevents the tile pathfinder choosing paths through this shape
 		FLAG_MOVING                   = (1 << 4), // indicates this unit is currently moving
-		FLAG_DELETE_UPON_CONSTRUCTION = (1 << 5)  // this entity is deleted when construction of a building placed on top of this entity starts
+		FLAG_DELETE_UPON_CONSTRUCTION = (1 << 5),  // this entity is deleted when construction of a building placed on top of this entity starts
+		FLAG_IS_SOCKET                  = (1 << 6)  // this entity is a slot where construction of a building placed on top of this entity starts
 	};
 
 	/**