(edit: SweetT beat me to it, had to put the kiddo to bed before I could reply. doh!)
Brad,
Are your numbers including "overhead" space for things like CRAC units, generator bays, battery rooms, etc? If not, that's why their numbers are likely low since afaik they owned/leased their own datacenter building. But, who knows which numbers are actually used in a press release, and if they are even close to accurate
By my math for a recent build we did, which does include some space for CRAC units and 3-phase PDU's, is roughly 26 sqft per rack. This is for a large "suite" (e.g. cage) inside an already functioning facility. When you include battery room and genset square footage, my 26 sqft per rack figure would go way up.
Otherwise, if they are using raw "this many racks fit in this many square feet" then yeah, it's a bit lower than my numbers as well. So low in fact, that I'm pretty sure the overhead space is included.
Nice "seeing" you at the show - quite literally, for about 5 seconds
-Phil