校舎
こうしゃ · kousha · JLPT N3 · noun
building
🏫 校舎 = school (校, as in 学校) + building/lodging (舎, as in 宿舎)
校 is the school kanji from 学校 (gakkou). 舎 means a building or lodging, as in 宿舎 (shukusha, dormitory) and 田舎 (inaka, countryside). Together they mean the school's physical building, not the institution.