Resturants with a sukkahhttp://yeahthatskosher.com/2014/10/kosher-restaurants-with-sukkot-global-list-2014/#USA
Search and you shall find..
That doesn't really answer the Q. Lots of restaurants make tiny sukkahs for the 2-3 days the need them. Very few have open large ones. Mendy's at the JCM uses the very large sukkahs built in front of the JCM.