noun which may take the genitive case particle 'no', noun
self-owned; one's own
Used attributively to describe something that belongs to oneself, often in legal, economic, or formal contexts.
自己所有の土地に家を建てた。
I built a house on my own land.
会社は自己所有のビルに移転した。
The company moved into its own building.
Compound of 自己 (self) and 所有 (ownership). The exact historical derivation is uncertain, but it follows a common Sino-Japanese word-formation pattern.