Maybe. The building exists, yes, but a lot of those buildings were built in the 1940s or so. The HVAC is retrofit, and there might be power, but probably not as much as they'd want and probably not the right Internet connection.

A lot of them are in cities, too, since they needed to be near the people with telephones. That means they'll be generating a lot of noise right where people are living.

Not to mention, the telcos probably don't want to give them up. They do use some of them (the one nearest me is a training site) but the land and building are also fairly valuable. Utilities don't like to give up stuff like that.