Directions to RLM 13.152:
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Take the elevator to the 13th floor.  When exiting the elevator, go east (the east end of the building is the end with the cafe/escalators downstairs) and turn right (south) immediately (the only way to turn).  You should see a Mathematics sign halfway down the hall ahead (if not, you went the wrong way from the elevators).  Go to the end of that hall, beneath the sign.  My office will be facing you at the end of that hall, just to your left.