Department of Magical Law Enforcement/Draco Rookwood's Subterranean Office Complex

This is the newly hollowed out sub-sub-basement section, still being pumped in parts, which Draco has commandeered for his use. It is to the side of and slightly below the Wizengamot courtrooms, although his access tunnel makes it a forty-five second stroll from his main room.

Draco plans to have his Junior Assistant and bodyguards in the adjoining chambers, so that nobody gets to him except through them.