Continuity mistake: When Silkie moults, he sprays the entire vicinity with his bodily residues, including the Titans. But after the regurgitated Johnny Rancid groans, "I got eaten," Raven is peachy-clean in the close-up when she murmurs, "So nasty", and right afterwards she is smudged again. And when Silkie and Starfire start gobbling up the residue, all the Titans are suddenly and fully cleaned up.
Continuity mistake: When the Titans enter the Tower ops room, only to find the mess Silkie has left behind, Raven's hood is down. As Robin comments on the damage, Raven steps up to the chewed-up sofa in the background with her hood up; but in the next shot, where she inspects the teeth marks on the sofa, her hood is down once again.
Continuity mistake: Beast Boy snatches Starfire, yanks her into his quarters and multiple-locks the door. When the door closes, we see a number of locks, a door chain and even a door knob on the panel. In the first shot, the fasteners and bolt holes are positioned on the door frame and the locks on the panel; but as Beast Boy locks up, both locks and bolts AND the bolts fasteners are all located on the door panel, thus making the locks effectively useless. (I know that the locks are there just for laughs, but still the sudden location switch of the fasteners is undeniably evident).
Chosen answer: It is located in California, as shown in "Teen Titans: Trouble in Tokyo". Possibly San Francisco as seen in the comics.
MasterOfAll