内うち廊ろう下か

noun

interior hallway; enclosed corridor

Refers to a hallway inside a building, especially in apartment complexes, as opposed to an open-air exterior walkway (外廊下).

• このマンションは内うち廊ろう下かなので、雨あめの日ひでも濡ぬれずに移い動どうできます。

  This apartment building has interior hallways, so you can move around without getting wet even on rainy days.