https://en.wikipedia.org/wiki/111_Eighth_Avenue
111 8th is a major internet traffic exchange point. It's also gargantuan, it's 2.9 million square feet and occupies a whole city block.
One of the interesting things about 111 8th is that it was designed for much higher than normal pounds per square foot floor loading. Which means that Google could convert the entire thing to datacenter space if they really wanted to. Already a significant portion of it is conditioned datacenter/telecom space run by tenants.