Why would you call colocation "building your own data center"? You could call it "colocation" or "renting space in a data center". What are you building? You're racking. Can you say what you mean?
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Still kudos going this path in the cloud-centric time we live in.
Thy will vary by country, by state or even county , setting up a DC in the Bay Area and say one in Ohio or Utah is a very different endeavor with different design considerations.