Honestly, perfect place for datacentres. Unlimited water in the pool area, electric sockets are likely live, unlimited space, no noise pollution, just have to put a data cable though the threshold.
I'm pretty sure the backrooms if they were real, they wouldn't be a horror thing, it would be full of people mapping it and living there. there would be a small organised millitia to neutralize dangerous stilllives. Plenty of hydroponic agriculture.
It would be interesting to see cities in the backrooms, where being there is just a normal thing... Nevermind, it already exists, it's called the Toronto Path
