Ok guys so I found this elevator door beneath map through act1,2and 3.We can pretend that this elevator door was used for the elevator, as we can see in alpha 3. As to why the elevator door has the "Out of Order" sign, I think the house was unfinished and the house has a perfectly reasonable shape, the floors are quite different sizes (but still equal on the elevator shaft) and accessible by elevator, as evidenced by Neighbor_3.Although Tinybuild said this is Test map, but looking at the map name and unused screenshots, we can assume this is Alpha 3 Prototype. However, since alpha 4 was released, they chose that the house should be weird, illogical, disproportionate because this is Nicky's (dream or imagination) about his cruel father. .So the idea of an elevator was removed 'cause its has only 3 floors at unequal heights were accessible from the "elevator". The door i just posted the photo was probably used for. cutscene.Btw,act1&2 may use the same map as act3 so they have the same models.This elevator door was using for cutscence