Depends on what defines a restaurant, is it the building or the people. While the building itself isn't mobile, the people who run the restaurant certainly are. If the manager, head chef, sous chef, maitre d', and a few other key people where to close up shop at their current location and set up a new place serving the same food a couple of blocks down the road, wouldn't that count as mobile. Sure it will cost a bit of cash upfront, but if they can negotiate a better deal on the rent, they'll quickly make that back.