Upgrading walls from Town Hall 16 to 17 for 40 Saudi Riyals. Other Town Halls:- From Town Hall 17 - 18, upgrading walls for 40 Saudi Riyals From Town Hall 15 - 16, upgrading walls for 35 Saudi Riyals From Town Hall 14 - 15, upgrading walls for 35 Saudi Riyals From Town Hall 13 - 14, upgrading walls for 30 Saudi Riyals From Town Hall 12 - 13, upgrading walls for 25 Saudi Riyals Other Town Halls, upgrading walls for 20 Saudi Riyals