別宅

1. Origins, structure, and basic meaning

• Structure: 別宅 is read as べったく and is a noun for a second home or villa kept apart from one's main residence.
• Basic usage: Ownership appears in 別宅を持つ, while staying there appears in 郊外の別宅で過ごす.

2. Common pitfalls and similar expressions

• A residence separate from the main home
  • The central idea is an additional house rather than the place used as one's primary residence.
• Relation to 別荘
  • Both can be translated as villa, but 別荘 readily suggests a vacation home, while 別宅 emphasizes a separate residence.