Yes, it didn't cover much area, I just curious what it is, and there is unknown block in bedroom。。。It looks like there was an elevator.
but this time it useless. I think you can't reconstruct this area or you can't make it useful.
it may use a small storage area.
but why are you bother this? it's not to cover many areas.
Thanks.A reason for investigating is (assuming you are in a heating climate) eliminating a potential thermal bypass. Unknown what the construction is like in there but open cavities between floors or worse between basement and attic can be extreme sources of heat loss. I can judge until we get pictures but i have discovered large and small and extreme is a mild description.