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508 Balcony is a location in Luigi's Mansion 3. It is found on the fifth floor of The Last Resort, the RIP Suites. It is a balcony adjacent to Room 508, Professor E. Gadd's hotel room. The white Gem can be found here. The door to the 508 Balcony is found in the northwest corner of Room 508.
There are a few plants and benches out on the 508 Balcony. There is also a table, a watering can, a telescope, and a toolbox. Luigi can use the watering can to water the small plants in the northeast and southeast corners, then flash them with the Strobulb to get treasure, similarly to in Luigi's Mansion: Dark Moon.