For those wondering how this got done so quickly, both campaigns had transition offices in DC--funded in part with federal dollars--that got started months ago.

The modern presidency is so complex that a transition can no longer be accomplished effectively in the time between November 8 and January 20. So a bipartisan project created the concept of multiple transition offices that get government funds to operate.

Obviously the Clinton transition office is in the process of winding now right now, and the Trump office is expanding rapidly.