From 1888 until its independence in 1984, Brunei was a British protectorate and land development began in 1906 when the British resident encouraged the Sultanate citizens to move onto reclaimed land on the western bank of the inlet. In 1899, first oil well was drilled at Ayer Bekunchi near Kampung Kasat, Bandar Seri Begawan. Although the well was drilled to a depth of 259 metres (850 feet), no oil was found. Oil exploration in Brunei later shifted to Seria and Belait District in 1924. Sultan Muhammad Jamalul Alam II established a new palace on the west bank in 1909 after being persuaded by the British, along with the arrival of Chinese traders to boost the economy. A mosque and government buildings were built along the western shores in 1920. In the same year, the new settlement was declared the new capital of Brunei and became a municipal area.