I think it would be worth having some sort of temporary 'Bridge Financing' period set up specifically when you're in between upgrading / moving properties.
Basically, giving a user a set time to clean up their crap.... I mean, gather any of their belongings :) Perhaps a 'Moving Day' buff, or something.
This way, you don't end up losing stuff you forgot about in your storage cabinet, floor, etc.
My $0.02 CAD, of course. Any thoughts?