51°30′15″N 0°07′33″W / 51.5042°N 0.1258°W
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Gwydyr House (Welsh: Tŷ Gwydyr) is a Grade II* listed[1] mansion in Whitehall, and is the London headquarters of the Wales Office. The house lies on the eastern side of the street, opposite Dover House.
- ^ Historic England. "Gwydyr House (Welsh Office) (1066107)". National Heritage List for England. Retrieved 3 July 2018.