Too much drawcalls for this simple scene?

In my scene I have a room. The room is built using planes built in blender (for walls, doors, floor and ceiling). I use the same material for all of these objects in the room and also marked them as static.
I also have a baked point light in the center of the room.

However when I run the scene in the profiler I get 23-25 draw calls. As I understood if I use the same material and mark the related objects with static they should require only one draw call.

(The door in the room is currently a wall with a rectangular cut in it but it is also marked as static and uses the same material)

How can I reduce the draw calls if possible?

In Blender, join the objects into one and export it.
And if you want you can also bake the material in blender.
Or verify in Unity if the Blender imported mesh objects uses same scaling, if they don’t Unity will don’t batch them and verify also in the profiler what use much SetPass calls.