I hope that most home office attorneys, spare room tycoons and carpet commuters are eliminating the paper and physical files from their lives. But, whether you need a bulk system of storage or a more decorative solution to carving out an office, you might want to consider something like BrickBox.
It is a shelf/storage solution that fits almost every purpose. Modular, it is a system designed and manufactured in Barcelona by Antxon Salvador and Roger Zanni. It can be assemble and stack, packed or transported by simply grabbing a handle. It comes 10.6″ x 10.6″ x 14.2″ (small) or 21.3″ x 10.6″ x 14.2″ (large). And, it made from birch plywood. BrickBox is searching for an American distributor, now. And, current pricing is between $40 and $60 per box.
The video below is in both Spanish and English and it goes back and forth from the two languages.