headquarters

Etymology

From head + quarters.

noun

1. The military installation from which troops are commanded and orders are issued; the military unit consisting of a commander and his support staff.
2. The center of an organization's operations or administration.
   As though on an incendiary rampage, the fires systematically devoured the contents of Edison's headquarters and facilities. 2006, Edwin Black, chapter 1, in Internal Combustion
3. A place of concentrated activity or influence.