off the plan

Prepositional phrase

Of a building, especially a residence, from the plan of a proposed building before it is actually built.

Japanese Meaning

提案された建物の設計図に基づき、実際に建設される前の建物（特に住宅）を指す表現。 / 建築計画中の住宅・建物、つまり完成前の物件に対して用いられる意味。

They bought the apartment off the plan to secure a lower price.

彼らはより低い価格を確保するために、そのアパートを建設前の設計図に基づいて購入しました。

Sense（1）

Of a building, especially a residence, from the plan of a proposed building before it is actually built.

Buying off the plan has become a more popular way of buying property in recent years.