Check the second / third story windows in the rooms on the stairs. My screenshot is from diag profiler so you will see a similar result with ease.
https://media.discordapp.net/attachments/769180545518665780/1061873649373679706/image.png?width=1627&height=910

This has resulted in the punishment of players who choose to make a base in here, unknowing that you can phase through these windows.

Again the building is Land_Factory_Small, thanks again. Love you Geez