The world's largest residential palace is the Istana Nurul Iman, near Bandar Seri Begawan, capital of Brunei. Official home of the 29th Sultan of Brunei, Hassanal Bolkiah, and also the seat of the Brunei government, the palace covers 200,000 m² (2,152,782 ft²) and contains 1,788 rooms. It also has 257 bathrooms, banqueting hall for 5,000 guests, large mosque, garage for 110 cars, air-conditioned stable for 200 polo ponies and five swimming pools. Designed by architect Leandro V. Locsin (Philippines), with interior designs by Khuan Chew (UK), the palace was constructed by Ayala Corporation and completed in 1984 at a total cost of around $1.4 billion.