Refers to the main headquarters of a company or the primary store of a retail chain. Often used in business contexts to distinguish the central location from branches.
See also: 本店
The company's head office is in Tokyo.
This store is the flagship store of the nationwide chain.
Compound of 総 (そう, 'general, overall') + 本店 (ほんてん, 'head office, main store'). The prefix 総 intensifies the notion of centrality.