1.
villa; secondary residence; detached mansion
A separate residence apart from one's main home, typically in a scenic location. Often implies a high-class or historically significant property.
A former zaibatsu family's villa is open to the public as a tourist attraction.
別 (separate, other) + 邸 (mansion, residence). Carries a more elegant and formal nuance than 別荘. Often used for historical properties belonging to aristocrats, feudal lords, or wealthy families. In modern usage, upscale hotels and ryokan sometimes use 別邸 in their names to evoke exclusivity.