|The following is based on Fallout: New Vegas behind-the-scenes mechanics and similar content.|
The 2EOCasHiHotelLobby is a test cell in the game files of Fallout: New Vegas.
The cell uses the same casino layout as 2EOCasLoHotelLobby, with a large central area, adjacent toliets for both genders, and corridors connecting it to another large room. Notably, there's a doorway leading downstairs to a Vault, indicating it's a (very) early version of what ultimately became Vault 21.
There are few creatures in the level. There's a pack of hostile coyotes near the entrance and a small group of NPCs (Mojave inhabitants and NCR soldiers), with a pair of children armed with service rifles. Interestingly, they will attack the player, rather than run away once provoked.
2EOCasHiHotelLobby remains accessible in the game files of Fallout: New Vegas.