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Castlereagh Street
Castlereagh Street is a short residential street in the western part of Marylebone, carrying a W1H postcode and positioned within the area historically associated with the Portman Estate. It lies between Marble Arch and the quieter residential blocks north of Oxford Street, close to the Hyde Park Estate boundary.
The street is named after Robert Stewart, Viscount Castlereagh, the 2nd Marquess of Londonderry, who served as Secretary of State for Foreign Affairs from 1812 until his death in 1822. Castlereagh was one of the most prominent British statesmen of the Napoleonic and post-Napoleonic era, representing Britain at the Congress of Vienna and shaping the European settlement that followed the defeat of Napoleon. Streets named after him in this part of London reflect the contemporary habit, common in early nineteenth century Marylebone, of honouring senior political figures alongside the aristocratic family names that dominate the estate's street map.
The built fabric on Castlereagh Street is predominantly modern, with properties largely dating from after 1980. A planning permission granted in September 2012 saw the demolition of earlier buildings and replacement with a five-storey residential scheme providing ten units. That pattern of incremental post-war and more recent rebuilding has removed much of any Georgian or Victorian original stock the street may have contained. Its present character is quietly residential rather than architecturally distinctive. Access to Portman Square and the broader Portman Estate grid lies a short walk to the north and east.
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