Group banks/Grubanks : A virtual cabinet unlockable only by a member of that group in your IMG hub.(The devs will decide what it is called)
Safes: Real objects in your house or tower that hold currants made by a construction tool or metalworker.
Locks: Items that can be put on your house, cabinets, safes, etc. I have come up with four types: Plain locks like your house key that a player gives you, A combination lock with a combination to remember, and a tax lock will requires one of something to get past (the item will be collected by the owner). Post ideas for more in the comments.