A technical high school in Nishi-Tokyo; the nearest station is Seibu-Yagisawa. That in the fiction the school occupies a disused building fits with the fact that Nishi-Tokyo has no private high schools.
ℹ️ A working school: you look at it from outside, without going in or disturbing lessons.
🚉 Seibu-Yagisawa · 14 min walk
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It is the model for the ‘school for returnees’ (帰還者学校), the institution that takes in the young survivors of SAO and that, in the fiction, reuses a disused school building in Nishi-Tokyo. Kirito and Asuna study there from the second season on.
Sources: renote.net · seichi-junrei.info · old.seichimap.jp
Nearby
Mitaka Station — south exit2.3 kmphoto by Mitsuyoshi Kondo · CC BY 3.0
Seikei University2.4 kmphoto by 李維俊(alen2864) · CC BY-SA 4.0
Koganei Municipal Sports Hall2.7 kmphoto by ITA-ATU · Public domain
Musashino Hachiman Shrine3.2 kmphoto by Higa4 · CC0