Istana Sultan Brunei ada 1,788 bilik ¹ , 257 bilik air, 110 garaj kereta dan 5 kolam renang. Bekas Istana Habsburgs ada 2,600 bilik di Austria

The Istana Nurul Iman is the official residence of the Sultan of Brunei, with 1,788 rooms ¹ , 257 bathroom, includes a 110-car garage and five swimming pools . Hofburg Palace in Austria with 2,600 rooms

Sources :
¹Majalah Mastika