The Headquarters is the home base of all things outside the reset of the universe, and is upkept by the Custodians of the new universe.
Purpose / Function
To house the Custodians and work as a safe hold for the devices used to maintain the new universe.
With every new set of tenants, the building gains new cultural representation.
With the first couple iterations of the universe, They Custodians didn't have access to a building, but as more and more sets of people began arriving after every reset, the building was built up higher and higher.