Remote physical mailbox check

I thought that might be the critical piece of information missing from your original description and I like to make cryptic comments so we can (slowly and painfully) draw out the essential details. :face_with_raised_eyebrow:

And of course you are not allowed to use the mains outlet in the mail room (where they plug in the vacuum cleaner).

I foresee a problem will be the multiple layers of reinforced concrete in the floors between the apartment levels.