Room 17B
59E59 Theatres, Off Broadway By Ben Charles BOTTOM LINE: Old-school comedy and clowning -- in suits and with a modern twist. Last night I visited room 17B. It's an interior office that is filled from floor to ceiling with gray filing cabinets and three doors. Oh, and there is also a xylophone...and a gong...and a few other small percussion instruments, as well. What appears to be a very drab office environmen…