What is "x-mansion"

The X-Mansion is the common name for a fictional location appearing in American comic books published by Marvel Comics. The mansion is depicted as the private estate of Professor Xavier, a character in X-men comics. It is the base of operations and training site of the X-Men and the location of a school for mutant teenagers, and sometimes older aged mutants, the Xavier Institute for Higher Learning, formerly Xavier's School for Gifted Youngsters. It is also the worldwide headquarters of the X-Corporation. Its address is 1407 Graymalkin Lane, Salem Center (part of the town of North Salem), located in the very northeast corner of Westchester County, New York. The school's motto is " mutatis mutandis." Recently, Wolverine re-opened the school, at the same address, under the name of the Jean Grey School for Higher Learning. Cyclops opens the New Xavier School for the Gifted in an abandoned Weapon X bunker somewhere in Canada.