I gave this a try with my GTX460, and that section outside with all the boxes in it is where i get the worst FPS. I get 23FPS there. But most other places of the map I get about 50-250 fps.
You should break this map into sections, and use instances of the boxes, bins etc. Have the mall walls,floor and ceiling as one mesh, then all the stuff inside as seperate props. also make those taller distance buildings a seperate mesh and instance those.
All the faces that aren't visible by the player should be deleted too. like the ceiling of the mall on the outside. the distant buildings roofs and bases should be removed also. The same goes for the stalls and vending machines too. This should increase performance for you.