This is a map called "gm_liminal_space" by Wayne Kerr and can be found in the workshop section of Steam if you have Garry's Mod on steam.
What I like about this map is that it has some Backrooms areas and is quite atmospheric. This may not be the most interesting map, but there is a lot to explore. I like the sort of rundown vibe of the place- it feels like an abandoned area.
Enjoy the exploration!
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Garry's Mod Liminal Space Map Exploration | NatokHD