Hmmmm. Lot's of factors would go into logically designing a data center, such as space available, location in the structure, environmental conditions, containment strategies available, greenfield build or retrofit, etc.
Infrastructure choices will also be dependent on how much control you have over the actual building itself. If you own the entire space, you can implement different solutions than if you lease the space and don't have control over the physical structure. It's pretty hard to convince a landlord to allow you to tear into the central HVAC system to access "free cooling".
Once the initial parameters are set, it is fairly easy to design with expansion in mind. You just don't want to design yourself into a corner by limiting power access. That is probably the most critical aspect to future proofing your data center. You can generally add more cooling as needed, but it gets very, very expensive to add more capacity from your electricity supplier once the utilities feed transformer is maxed out.
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