Originally Posted by mdk42

Costs can vary widely. I build data centers for a living and hate to quote costs per square foot because cost can vary based on tier level, power consumption, whether you're discussing square footage of white space vs. building square footage, redundancy, etc. I've built 20,000 sq. ft. (sq. ft. of computer floor) data centers for $11M and have built 100,000 sq. ft. (sq. ft. of computer floor) data centers for $200M - it really depends on what the design intent is. If you're considering, I'd recommend finding someone who specializes in designing and/or building data centers and have them analyze your needs and schematically design and budget to your needs. It will probably save you 100x their fee for a little bit of upfront work.