Townhouse (Great Britain)

In British usage, the term townhouse originally referred to the opulent town or city residence (in practice normally in Westminster near the seat of the monarch) 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, comparable to the hôtel particulier, which notably housed the French nobleman in Paris, as well as to the urban domus of the nobiles of Ancient Rome, but many were terraced buildings.

Source: Wikipedia — Townhouse (Great Britain) (CC BY-SA 4.0)