An expansion on the frequently liked “one per person” shop stands
Treasure chests look like an open treasure chest filled with coins, gems etc. You can either set them to one item per person or free-for-all. Maybe have a “1pp” on the front of the chest if they are in 1 per person mode.
People can freely add items to them without permissions
They hold 48 slots (or unlimited, if in free-for-all mode only - to prevent “abuse”)
I have junk in my inventory and wouldn’t mind shoving it into an unsorted treasure in the mall lobby for anyone to take. Treasure chests would give people a way to attract visitors to their build, both with one per person and free for all.