buildings with unusual occupancies or high levels of complexity, for example shopping centres occupied by shoppers and workers, conference centres and hospitals
adeiladau â meddiannaethau anarferol neu lefelau uchel o gymhlethdod, er enghraifft canolfannau siopa ble y ceir nifer uchel o siopwyr a gweithwyr, canolfannau cynadledda ac ysbytai