Crossword Puzzle Area of activity

Clue: Area of activity

Office building area (ATRIUM with 6 letters)
Office work areas (CUBICLES with 8 letters)
Office support area (DATAENTRY with 9 letters)
Open areas in office buildings (ATRIA with 5 letters)
Offstage areas (WINGS with 5 letters)
Assigned office area (WORKSTATION with 11 letters)
Post office activity, or a hint to this puzzle's theme (LETTERSORTING with 13 letters)
Areas of activity (e.g. ARENAS with 6 letters)
Protest activity for ANWR drilling proponents against EPA officials? (SNOWBALLING with 11 letters)
Office activity (FAXING with 6 letters)