"Built in 1934, this six-storey building was once the largest government building of its time. Shortly after its completion, World War II fell upon Singapore, and so started the days of darkness under the Japanese Occupation. During this time the building was used by the Japanese military police, the Kempeitai, as a holding area and torture chamber for prisoners."
Hike It! Singapore River by Chan Chi Ling
"Presently, the National Heritage Board, the National Arts Council and several private art galleries occupy this building that is adorned with 911 brightly-coloured windows. The Hill Street building was gazetted as a National Monument on 18 December 1998."
Singapore's Monuments & Landmarks: A Philatelic Ramble by Tan Wee Kiat, Edmund WK Lim and Kevin YL Tan
"This is an imposing, six-storeyed corner corner building done in an Italianate neoclassical style." A Walking Tour Singapore by G.Bvrne Bracken
Note: "Neoclassicism was popular in Singapore for government buildings, as it was in most of the British colonies right up until the outbreak of World War II. The Istana is a good example of a building in the neoclassical style that follows the rules well." A Walking Tour Singapore by G.Bvrne Bracken