X-Mansion
The ancestral Xavier estate, located at 1407 Graymalkin Lane, just outside of Salem Center, Westchester County, New York. The mansion has three wings, including men's and women's dorms, Xavier's office, classrooms, and recreational areas. A pool and a basketball court are located in the back, and the grounds include a baseball field, as well. The basement levels are where the mansion's true uniqueness lies. There are secondary dorms and living areas, as well as the War Room, the Danger Room, and the hangar bay. The mansion is powered by a geothermal plant, and is equipped with state-of-the-art facilities and security systems, many of which are Shi'ar technology. However, during Operation: Zero Tolerance the mansion was stripped bare by nanotechs, and so all of this technnology was lost to the X-Men, who are only now beginning to rebuild their base. The mansion has been partially or fully destroyed more than a few times, but it is always rebuilt, because it is the most important thing for the X-Men (and their affiliates): their home.
Professor Xavier's sanctum sanctorum, where e monitors world events and plans the future of mutantkind. It is equipped with countless TV screens and terminals, allowing him access to news, his files and other sources of information all at once. When in the War Room, Xavier usually places himself in a gyro-chair which links him telepathically to some of the systems.