The Palace of Parliament in Bucharest is the world's largest civilian administrative building. Measuring 270m by 240m with 1,100 rooms spread over 12 stories and 4 underground levels, it was designed and nearly completed by the Ceaușescu regime as the seat of political power in Romania. At 86m tall and with a floor space of 340,000 square meters, it remains the most expensive and heaviest administrative building according to the Guinness Book of World Records.