Answer the following question: The Istana is the official residence and office of the President of Singapore. Meaning palace in Malay it is where the president receives and entertains state guests. The Istana is also the working office of the Prime Minister of Singapore. It is in a large open compound in the otherwise urbanised setting of the Orchard Road area.The 106 acre (0.4 km) estate was once part of the extensive nutmeg plantation of Mount Sophia. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Building