Chaeng Watthana Government Complex ( Thai : ศูนย์ราชการแจ้งวัฒนะ ), or formally, the Government Complex Commemorating His Majesty the King's 80th Birthday Anniversary, 5 December, BE 2550 (2007) ( Thai : ศูนย์ราชการเฉลิมพระเกียรติ 80 พรรษา 5 ธันวาคม 2550 ), is a complex of Thai Government buildings on Chaeng Watthana Road , Thung Song Hong Subdistrict, Lak Si District , Bangkok . The complex was built in commemoration of King Bhumibol Adulyadej 's 80th birthday. The complex construction project started in 2005 under Thaksin Shinawatra 's regime and was completed in 2008. Its opening ceremony was held on 17 February 2010 by Crown Prince Vajiralongkorn and Prince Dipangkorn Rasmijoti . The project cost 20,000 million baht .
5-576: The 349 rai (55.8 ha; 138 acres) of land on which the complex sits belongs to the Treasury Department, Ministry of Finance . The complex is administered by Dhanarak Asset Development (ธนารักษ์พัฒนาสินทรัพย์) or DAD, a state enterprise attached to the Treasury Department. It was served by Government Complex MRT station since 21 November 2023. The complex is divided into three zones: Zone A (100 rai) and Zone B (197 rai) are for government buildings, and Zone C (152 rai) supports
10-534: The Ratthaprasatphakdi Building (อาคารรัฐประศาสนภักดี), is in Zone B and is includes administrative agencies: Other buildings include the "Chaeng Watthana Centara Government Complex Hotel and Convention Centre", a hotel with a convention centre called "Wayuphak Hall". Rai (unit) The rai , ngan , and tarang wa or square wa are customary Thai units of area , used in
15-540: The metric system in 1923, although the Royal Survey Department was already reported in 1908 to be using the metre-based conversion for its cadastral maps . The units are commonly used for cadastre and property matters, and official and legal documents express areas of land in such units. They are sometimes notated in the abbreviated format rai - ngan - tarang wa , e.g. "4-2-25 rai ", which means "4 rai , 2 ngan , and 25 tarang wa ", though this
20-502: The growth of the complex itself. The governmental buildings in the complex are divided into two groups: Building A (อาคารเอ), or formally, the Ratchaburidirekrit Building (อาคารราชบุรีดิเรกฤทธิ์; named for Prince Raphi Phatthanasak, Prince of Ratchaburi (1874–1920), whom some consider to be the "father of Thai law"), is in Zone A and includes the justice-related agencies: Building B (อาคารบี), or formally,
25-527: The measurement of land. They are defined as exactly 1,600, 400, and 4 square metres , respectively (17,222, 4,306, and 43 sq ft). The tarang wa (square wa , tarang meaning 'grid') is derived from the area of a square with sides of 1 wa (the Thai fathom ). One ngan ('work') is equal to 100 square wa , and one rai ('field' or 'plantation') equals 4 ngan or 1 square sen . The units were standardized in square metres when Thailand (then Siam) adopted
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