our business office; this office
Used in formal business correspondence or announcements to refer to the speaker's or writer's own business office. The prefix 当 (とう) means 'this' or 'our' in a humble, self-referential way.
Our business office will change its operating hours starting next month.
Please contact our business office for inquiries.
Compound of 当 (とう, 'this/our') + 営業所 (えいぎょうしょ, 'business office'). The prefix 当 is commonly used in formal business Japanese to refer to one's own organization or location.