Iveagh House is the headquarters of the Department of Foreign Affairs and Trade in Dublin. It is also sometimes used colloquially as a metonym referring to the department itself. Iveagh House was originally two houses, nos 80 and 81. St. Stephen's Green. No. 80 was designed by Richard Cassels in 1736 for Bishop Clayton. After both houses were bought by Benjamin Guinness in 1862 he served as his own architect, combined the two houses and produced the building as it now stands. The building was donated to the Irish state by Benjamin Guinness's grandson, Rupert, Lord Iveagh, in 1939, and was renamed Iveagh House. (wikipedia.org)