The type of Data Center I use and am responsible for is not a rental space. It is for my company, exclusively. We do use one about 40 miles away that does have rackspace for rent that could absolutely absorb 2MW (they're currently expanding into a one million square foot renovation). Off the top of my head the one "room" (it's more like a hallway with hallways off of it) we have at the commercial space holds ten rows with 9 racks per row so that's 90 racks in one "room" if you're using both sides of the area.

Wow, a 1 million square foot DC is an absolutely huge facility. I might be out of date, but that would have been one of the largest in the world just a couple years ago. That's going to be a multi-billion dollar renovation. I'm sure a facility like that could definitely squeeze in an extra couple MW without batting an eye.