Method made static and moved to manager.

src/engine/net/client/handlers/DestroyBuildingHandler.java

@@ -95,7 +95,7 @@ public class DestroyBuildingHandler extends AbstractClientMsgHandler {
                 city.setWarehouseBuildingID(0);
         }
 
-        building.setRank(-1);
+        BuildingManager.setRank(building, -1);
         WorldGrid.RemoveWorldObject(building);
         WorldGrid.removeObject(building);
         building.getParentZone().zoneBuildingSet.remove(building);