principal residence; main house
Refers to the primary home of a person or family, often contrasted with a secondary or vacation home. Used in formal or descriptive contexts.
彼は別荘よりも本邸で過ごす時間のほうが長い。
He spends more time at his principal residence than at his villa.
Compound of 本 (hon, 'main') and 邸 (tei, 'residence'). The kanji 邸 specifically denotes a stately or formal residence.