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:horse:
Being the IT also can have it's downfalls. If anything leaks out or breaks in etc etc, it falls on your ass. In this respect, outsourcing it may be the better choice.
The hands down most expensive thing to do is to NOT do it right.
Leave the keycard access with the facilities dept, or at least make sure they have control over its operation. Nothing hurts us more than when we need to get a vendor in the building to fix a heat pump at 3am and we can't get a hold of the access badge people.