Teacher's Office is the most commonly used phrase to refer to a teacher's workplace or room where they perform administrative tasks.

来源：这个短语是由两个单词 teacher 和 office 拼接而成，表示教师的工作场所或办公室。

Examples:

The teacher's office is located on the second floor of the school building.
(教师办公室位于学校大楼的二楼。)

The teacher is not available right now, she is in her office grading papers.
(教师现在不在，她在办公室里批改试卷。)

You can schedule an appointment with the teacher by visiting her office during her office hours.
(你可以在教师办公室开放时间预约与她的会面。)