Ever thought of putting up some houses for sale within some of the major cities? A place to store things, guarded by a hefty mercenary or two? With a locked door needing a skilled lockpick to get through?

Or maybe for high ranking members of the cabals. Put them past the inner guardian and guarded by a bit tougher guard/guards. Again needing a skilled lock pick to get in. Might add some extra need of a thief/lockpicker when raiding to get some goodies.

You could also just make the rooms even harder to get into etc. and make it so you can't store limited items there to avoid hoarding.