It's bizarre that Digital Realty wants to put a DC in a town centre. Surely the latency disadvantage from being outside city limits is neligible.
It is crazy how you see so many datacenters getting built in places of high land value such as say northern virginia. Why not just build them in west virginia and build twice as many for the same spend? They'd probably even let you burn coal to power them.
Don't know about US, but I work within European Datacenter where we intend to have excess heat to be used for residential building heating [1]. You must be in proximity of the consumer for this to be possible. Not necessarily center is needed, but even then, DCs can be pretty :)
For example our office is heated using heatpump that has >22C of water heated by equipment as a source.
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