The Istana Nurul Iman palace is the residence of the sultan of Brunei. It is located 3 km southwest of the city centre. Its name is taken from Arabic, meaning "Palace of the Light of Faith." The palace was designed by Leandro V. Locsin and built by the Filipino firm Ayala Corporation, mixing Malay and Islamic elements in the building architecture. It contains 1,788 rooms, with 257 bathrooms, and a banquet hall that can accommodate up to 5,000 guests. The palace only opens to the public during the yearly three-day Hari Raya Adilfitri celebration.