I know a lot of folks need more storage. I was thinking that maybe avenues could have "secret" lockable storage rooms. Maybe an avenue with a cave, pirate theme, where the stuff could be hidden.
Or maybe just movable hidden rooms like the bookcase that can be put anywhere and locked. Entrances could look like a door, cave, safe, storage shed, manhole cover,
They could be sold in the Depot in a section for storage.