The first purpose-designed embassy building in Washington appears to have been the embassy of the Kingdom of Siam, now the Consular Services of the Embassy of Thailand on 2300 Kalorama Road NW, built in the 1920s.
Thailand before 24 June 1939 and again from 8 September 1945 to 20 July 1949
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Lippershey's application for a patent was mentioned at the end of a diplomatic report on an embassy to Holland from the Kingdom of Siam sent by the Siamese king Ekathotsarot: Ambassades du Roy de Siam envoyé à l'Excellence du Prince Maurice, arrivé à La Haye le 10 Septemb. 1608 (Embassy of the King of Siam sent to his Excellency Prince Maurice, arrived at The Hague on September 10, 1608).
Anglo-Siamese Treaty of 1909, between the United Kingdom and the Kingdom of Siam determining the border between Thailand and Malaya