The Grand Lobby is the first floor of The Last Resort in Luigi's Mansion 3. It is the first area to be explored in the game. At the start of the game, the lobby is bright, colorful, and lit up, with presents and staff everywhere. There are also pictures hanging from the ceiling of Luigi, Mario, Princess Peach, and Toad. Most parts of the Grand Lobby are inaccessible at this time, including the elevator and the stairs to the second floor. Luigi must talk to the Steward at the front desk to check in. Hellen Gravely then appears and escorts them up to their rooms on the fifth floor, the RIP Suites.
The next time the Grand Lobby is visited, it undergoes major changes. It is much darker and less colorful. There are jack o' lanterns scattered across the floor, and the swan ice sculptures are now gargoyles. The pictures above now have X's over them. Luigi discovers two Goobs barring up the front door and defeats them. Polterpup then leads him up to the second floor, where they find Professor E. Gadd trapped in a painting.
The Grand Lobby is the only floor of the hotel with no boss ghosts.