My impression was that the Angel 24 store was on the lobby of the Schale building. This is supported by Sora's ministory.
However, based on the map layouts of the building in-game, the double glass door that lead into the building are on the "Office" level. What looks to be the main Schale office from the background art is also here.
On the living quarters, there is an elevator shaft, which means it's at a higher floor. The "convenience store" is here.

We know for certain that the main office where Sensei stays at is somewhere halfway up the building. The CG of the gas explosion leaves no room for doubts. Does this mean that the Lesson mode layouts are non-canon? Or maybe the living quarters ARE on the ground floor? And if so, where is the entrance to the building?

>>715153421 (OP)
>the Schale building
Since when were you under impression there's only one Schale building? It seems like it has a whole campus to it, with a bunch of different buildings, including Schale Office and Schale Residence Hall.

>>715153421 (OP)
ibuki...

>>715153695
The place is always referred to as a singular building. There is nothing to support the idea that Schale is more than one office building.