What was this building at DHS?

Anyone know what this building (bluish-grey at the top middle of the picture) that is currently dubbed “Guest Services” used to be? (Or has it always been the same?) It’s down the lane from Rockin’ Rollercoster

The spot that is labeled, I believe, is just a GS kiosk. The larger grey building is the relatively new “multiple use” space. I believe that it is currently the location of the Villains Party.