Base
A penthouse in New York City; formerly Fisk Tower in New York City, a mansion in Westchester County, Las Vegas.
Serval Industries, Virginia; formerly X-Factor Investigations Headquarters, Starjammer; Xavier Institute for Higher Learning, Salem Center, Westchester County, New York; Genosha; X-Factor HQ, Washington D.C., Maryland; Mutant Research Center, Muir Island;