"38th floor" is the Engpsh equivalent of 第38楼.

The term "floor" refers to a level of a building, typically one of several levels of a structure that is separated by floors. It is used to refer to the level or storey of a building that is being referred to.

Here are a few example sentences using "38th floor" in context, along with translations in Chinese:

"My office is on the 38th floor of the skyscraper downtown." (我的办公室在市中心的摩天大楼的第38层。)
"I need to go to the 38th floor for a meeting." (我需要去第38层开会。)
"The view from the 38th floor is incredible." (第38层的景观非常棒。)