階かい段だんの吹ふき抜ぬけ

expression, noun

stairwell

Refers to the open vertical space around a staircase, often in a building with an atrium-like design.

• このビルは階かい段だんの吹ふき抜ぬけが明あかるくて気き持もちがいい。

  This building has a bright, pleasant stairwell.