Headquarters is the official addresss of an incorporated company. It is fixed in the bylaws during the incorporation and can be modified at anytime during the company lifetime.
It can be fixed at CEO's residence, shareholder's premices, in commercial lease or at a registered address provided by a domiciliatory agency.
If the transfer of headquaters changes your department location, two legal announcements must be made and additionnal court fees shall applied. Update your certificate of incorporation with your company's new address.