um...kinda fuzzy as far as the layout is but I can come up with something quick...
==Basement==
The basement is basically just a torture chamber. It is an expansive underground bunker of torment, filled with weapons and torture devices suited to harm people, both human and superhuman (feel free to make up your own special devices or weapons or the like to make it seem that much more gory...also would be a good place for a psychometric to pick up painful psychic imprints, for a medium to encounter a few tortured souls, etc.). As such, it is dark, dank, and smells of dirt, death and blood.
==First Floor==
Okay, I know that it's like a mansion, and the main things on the first floor are the "throne room", the psychic common room and Dane's bedroom. You walk down the hall, and to your right is the throne room. Across the hall from the throne room, to the right is the psychic common room, the room where Caleb's psychics meet, and wait until called forth by Caleb to report any revelations they receive. Next door down the hall on the right is the kitchen, which leads to the large dining room. Down the HALL, and around the corner from Caleb's throne room is Dane's bedroom. Dane's Room: at least one bad of weed, a few matchbooks and at least a FEW porn mags laying around, as well as a game system with controllers...
==Second Floor==
On the second floor there's the War Room and a few bedrooms, including Caleb's master bedroom. Caleb's master bedroom is in the center of this story, and cannot be reached through any of the other bedrooms (on one side of the hall, a wall of Caleb's bedroom, on the other side, a bedroom). The War Room is directly across the hall from Caleb's bedroom (on the right, if looking at a floor plan). The War Room is guarded at all times by two superhumans, and the guards change shifts every two hours, ON THE DOT. Inside, there are cameras and guards at each corner of the room, and there is a large, long metal table for drawing out plans and such. There is also a long whiteboard, a holographic projection map built into the table, and the like.
==Third Floor==
Third floor is really just a few towers at each corner of the mansion that the Trelaine Brothers retreat to for solitude. A panic room, a peaceful retreat, a place to stave off intruders, what have you.
Other than that feel free to make up stuff to embellish the awesomeness of Caleb's evil overlord bachelor pad of doom...
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)