It was a massive, airy space with white marble floors, soft blue-painted walls, and a ceiling made entirely of glass. Draco could make out the turret that they believed housed the Domina's records as well as, most likely, Hermione's magic, shooting into the air on the far side of the chamber, visible through the window-paned ceiling. Cecily had been unable to tell them or otherwise hint at the location of Hermione's magic, or what it was kept in, or anything about it, really. Draco didn't even know if they were searching for a tangible object or not, but had to assume they'd feel it when (if) they found it. There were five other doors (in addition to the one they'd just entered through), dotting the walls. Two on the left wall, two on the right, and one on the far wall. Windows on the left and right walls caused him to pause and consider for a moment. They were in the center of the mansion - the outer-most walls presumably somewhere far beyond the boundaries of this room. Magical windows, clearly. Given that the turret was directly over head and sort of in front of where Draco now stood, he was forced to conclude that the door on the far wall, the one behind a table occupied by six incredibly tense women, was the door that led to it.