There's a building in lower manhattan that was designed for that purpose as well: https://en.wikipedia.org/wiki/33_Thomas_Street https://en.wikipedia.org/wiki/3

There's a building in lower manhattan that was designed for that purpose as well: https://en.wikipedia.org/wiki/33_Thomas_Street https://en.wikipedia.org/wiki/33_Thomas_Street Technically there are two buildings built for telephone switching, but I don't think the other building (375 Pearl St) is nearly as overbuilt.