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floor space
この部屋の床面積は広い。
This room has a large floor area.
床面積が同じでも間取りで広さの印象が変わる。
Even with the same floor area, the layout affects how spacious it feels.
購入前に床面積と建ぺい率を確認しておくべきだ。
Before purchasing, check the floor area and building coverage ratio.