It's on the first floor in the office building.

它在办公楼的一层。

youdao

Somehow he survived the jump from the third floor of the building.

不知怎么的，他从四楼上跳下来竟然幸免于难。

《牛津词典》

They were on the upper floor of the building.

他们在该建筑物的上层。

《柯林斯英汉双解大词典》

The huge Saturn rocket, as tall as a thirty-six-floor building, was the heaviest thing ever to leave Earth.

VOA: special.2009.07.08

First, take the case in the elevator is on the ground floor of some building and completely addressed.

首先我们来看看电梯,在一楼时候的情况

耶鲁公开课 - 基础物理课程节选

You can do that on email, you can do that in my office, which is downstairs on the first floor of this building, in LC-109.

发邮件，来办公室找我，我的办公室在这栋楼的1层，LC109室。

耶鲁公开课 - 现代诗歌课程节选

That appears not to be necessary after NYSE said its building and floor are capable of handling a normal trading session.

FORBES: Stock Market To Reopen Wednesday After Hurricane Sandy Hammers New York

In an unremarkable office building one floor above, Edward Anderson ignores a nasty head cold and scrutinizes the expense budgets of a handful of private companies.

FORBES: Cool Heads

An elevated walkway led to the upper level of the main lodge, a three-story building with floor-to-ceiling windows that afford magnificent and ever-changing views of the pink-hued Hazards mountains across the bay.

FORBES: Tasmania's Remarkable Saffire Freycinet