Hookers! No, wait...um, I meant, an extradimensional space. Or lots of extradimensional spaces. I see those 20' diameter towers and always wonder how some double-digit-level archmage fits all of his stuff in there. Clearly they're larger on the inside than the outside. Any epic-level mage worth his bag of components is going to have a few pocket dimensions in his tower...good place to put the library, the treasure closet, the swimming pool (around which are gathered the HOOKERS!), etc.
M