Equinix owns PAIX on 529 Bryant St. as SV8.
It's interesting how racks still aren't so much volume-, mass-, or network bandwidth-/transit-constrained, but power-constrained.
Even with what is now a "small" 5kW thermal power budget per 44U cabinet, measuring 24 inches wide x 48 inches deep, you can easily exceed that 5kW long before you physically fill the cabinet with servers.
You can only get so much cooling density. And loading up a rack can use a signifigant portion of cooling.
Its pretty easy now-a-days to get 18kW into a rack, which will require 5 tons of cooling. Ie. enough cooling to handle a 3,000 ft^2 house.