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The Grand East is a location in Treacherous Mansion in Luigi's Mansion: Dark Moon. Found on the east side of the first floor of the mansion, this room is a hallway that connects the Jungle Exhibit, Ancient Exhibit and Restrooms together.
In this area, there are various dressers with differing contents, some gargoyles that can be interacted with to make coins appear, some sand in front of the Ancient Exhibit, a fallen chandelier and a gap that can be used to see into the Restrooms.
During Double Trouble, Luigi has to navigate the Grand East to get from the Jungle Exhibit to the Ancient Exhibit and the Restrooms. If he return here after he has Toad, two Sneakers will also attack him.
In all later missions, the Grand East is merely used as an optional corridor between exhibits.