Index: public/simulation/data/technologies/carthaginians/upgrade_house_to_apartment.json
===================================================================
--- public/simulation/data/technologies/carthaginians/upgrade_house_to_apartment.json
+++ public/simulation/data/technologies/carthaginians/upgrade_house_to_apartment.json
@@ -0,0 +1,15 @@
+{
+	"genericName": "Apartment",
+	"description": "Carthage was small for so many people, and it was there that Carthaginian engineering acted, pioneering the construction of large-scale buildings. They were small buildings, with up to six floors.",
+	"requirements": {
+		"all": [
+			{ "tech": "phase_village" },
+			{ "civ": "cart" }
+		]
+	},
+	"requirementsTooltip": "Unlocked in Village Phase.",
+	"icon": "house_upgrade.png",
+	"researchTime": 120,
+	"tooltip": "Search to unlock apartment upgrade.",
+	"soundComplete": "interface/alarm/alarm_upgradearmory.xml"
+}
Index: public/simulation/templates/structures/cart/apartment.xml
===================================================================
--- public/simulation/templates/structures/cart/apartment.xml
+++ public/simulation/templates/structures/cart/apartment.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="structures/cart/house">
   <Cost>
-    <BuildTime>75</BuildTime>
+    <BuildTime>80</BuildTime>
     <Resources>
       <wood>225</wood>
     </Resources>
@@ -10,7 +10,7 @@
     <Max>9</Max>
   </GarrisonHolder>
   <Health>
-    <Max>1500</Max>
+    <Max>1800</Max>
   </Health>
   <Identity>
     <GenericName>Apartment Building</GenericName>
@@ -21,6 +21,7 @@
   <Population>
     <Bonus>15</Bonus>
   </Population>
+  <Upgrade disable=""/>
   <VisualActor>
     <Actor>structures/carthaginians/apartment.xml</Actor>
   </VisualActor>
Index: public/simulation/templates/structures/cart/house.xml
===================================================================
--- public/simulation/templates/structures/cart/house.xml
+++ public/simulation/templates/structures/cart/house.xml
@@ -10,6 +10,17 @@
   <Obstruction>
     <Static width="13.0" depth="13.0"/>
   </Obstruction>
+  <Upgrade>
+    <Apartment>
+      <Entity>structures/cart/apartment</Entity>
+      <Tooltip>+50% health, +5 population bonus, and +3 garrison capacity.</Tooltip>
+      <RequiredTechnology>carthaginians/upgrade_house_to_apartment</RequiredTechnology>
+      <Cost>
+        <wood>75</wood>
+      </Cost>
+      <Time>40</Time>
+    </Apartment>
+  </Upgrade>
   <VisualActor>
     <FoundationActor>structures/carthaginians/fndn_house.xml</FoundationActor>
     <Actor>structures/carthaginians/house.xml</Actor>
Index: public/simulation/templates/template_structure_civic_house.xml
===================================================================
--- public/simulation/templates/template_structure_civic_house.xml
+++ public/simulation/templates/template_structure_civic_house.xml
@@ -51,6 +51,7 @@
       pop_house_01
       pop_house_02
       unlock_females_house
+      carthaginians/upgrade_house_to_apartment
     </Technologies>
   </ProductionQueue>
   <Sound>