underground hence the basement with a hole in the wall where the enemy has made a tunnel from inside the drainage pipe leading down to it.
(need to figure a way for the players to run the gauntlet and not be able to use their tunnel to return with the intelligence [then having to use the remaining drainage tunnel and out in the open to make their way back to base] )
I put some steps at the back of the shop building (next to the spawn room with the 3 green doors ) that any snipers or engies could get up onto the roof if they so wished (bare in mind I didnt put the overhang shelter in that pic)
there should be another tunneled hole into the upstairs part of the basement from (lets say) a disable toilet cubilcle (bigger so more plausable) . As I mentioned. Save that pic to disk to get a better overall plane of upper and basement levels