by owner

especially of a sale or attempted sale of real property

(of a sale or attempted sale, especially of real property) Without a real-estate agent or broker representing the seller.

Japanese Meaning

仲介業者を介さずに、所有者自身が直接販売（特に不動産の売買の場合） / 業者を介さない直接販売 / 所有者自身による取引

The farmhouse was listed for sale by owner, attracting buyers who wanted to avoid agent fees.

その農家の家は仲介業者を通さず売主自身が直接売りに出しており、仲介手数料を避けたい買い手を引き付けた。

Sense（1）

(of a sale or attempted sale, especially of real property) Without a real-estate agent or broker representing the seller.

CAR FOR SALE BY OWNER