こうしゃ校舎kousha
1.
A building designated for use by a school, containing classrooms and facilities for educational activities.
2.
The physical structure within which a school operates, serving as the environment for students to engage in learning.
3.
An architectural space associated with a specific educational institution, providing the necessary infrastructure for teaching and learning.
Example:
３ヶ月すれば、私たちの新しい校舎が完成するでしょう。