I recall hearing in the video there would be a discount if you own the 1st floor, but so far we can only guess that it might follow the 15/10/5/5 pricing like the original mansion. It could turn out to be different.
Wonder if it will be like so many other things on home and our friends will have to own the second floor to visit the second floor lol I know thats not the case with many personal spaces but I can't recall one where you could just run between the sections. Would suck if you run up the stairs and they are stuck at the bottom lol
I don't own those spaces though, so I'm not sure whether they all use the same 100 item slots as a whole, or if the add-on has 100 more. Do any Avalon Keep and add-on owners know?