diff --git a/mods/ts/rules/civilian-structures.yaml b/mods/ts/rules/civilian-structures.yaml
index 5816f2c22f..6c63f8ee91 100644
--- a/mods/ts/rules/civilian-structures.yaml
+++ b/mods/ts/rules/civilian-structures.yaml
@@ -1191,88 +1191,34 @@ GAKODK:
 		Sequence: small-lights
 
 GAOLDCC1:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Construction Yard
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GAOLDCC2:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Temple
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GAOLDCC3:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Weapons Factory
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GAOLDCC4:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Refinery
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GAOLDCC5:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Advanced Power Plant
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GAOLDCC6:
-	Inherits: ^CivBuilding
+	Inherits: ^OldBase
 	Tooltip:
 		Name: Old Silos
-	Building:
-		Footprint: xx xx
-		Dimensions: 2, 2
-	Armor:
-		Type: heavy
-	Health:
-		HP: 400
-	RenderSprites:
-		Palette: player
 
 GASAND:
 	Inherits: ^Wall
diff --git a/mods/ts/rules/defaults.yaml b/mods/ts/rules/defaults.yaml
index 87f8617aa6..fac73a12e6 100644
--- a/mods/ts/rules/defaults.yaml
+++ b/mods/ts/rules/defaults.yaml
@@ -194,6 +194,18 @@
 	RenderSprites:
 		Palette: terraindecoration
 
+^OldBase:
+	Inherits: ^CivBuilding
+	Building:
+		Footprint: xx xx
+		Dimensions: 2, 2
+	Armor:
+		Type: heavy
+	Health:
+		HP: 400
+	RenderSprites:
+		Palette: player
+
 ^CivBillboard:
 	Inherits: ^CivBuilding
 	Building: