[Autumn]

I think I read somewhere that you cannot retrieve an extra level(and trade it) until a house file is deleted, and currently the only way to delete a house file is to delete your character.

I think it'd be much more convenient to be able to use an extra level you're not using at that moment, and for that, I think the addition of adding the ability to erase a floor, and/or erase a house file, is an important feature to have, so that you may be able to:

1) Start from scratch
2) Re-use any extra floors you are not currently using, either on that character or your alt.