我住一楼。

Wǒ zhù yì lóu.

I live on the first floor.

我从五楼跑下一楼。

Wǒ cóng wǔ lóu pǎo xià yì lóu.

I just ran from the fifth floor to the first floor.

整栋楼都停电了！

Zhěng dòng lóu dōu tíngdiàn le!

The whole building is out of power!