Arundel House was a London town-house located between the Strand and the River Thames, near the Church of St Clement Danes.
Arundel House (viewed from the north), 1646 engraving by Adam Bierling after a drawing by its then occupant, Wenceslaus Hollar.
Townhouse (Great Britain)
In British usage, the term townhouse originally referred to the opulent town or city residence of a member of the nobility or gentry, as opposed to their country seat, generally known as a country house or, colloquially, for the larger ones, stately home. The grandest of the London townhouses were stand-alone buildings, but many were terraced buildings.
Spencer House in St James's, London, one of the last surviving true townhouses still owned by the noble family that built it, the Spencers, although it is now generally leased out commercially. The corresponding country house is Althorp in Northamptonshire.
The Strand front of Northumberland House in 1752 by Canaletto, the townhouse of the Dukes of Northumberland. Note the "Percy Lion" atop the central facade.
Devonshire House, Piccadilly, in 1896
Leicester House on Leicester Fields, 1748