noun
brokerage company
A business that acts as an intermediary or broker, arranging transactions between parties.
この仲立ち営業は不動産取引を専門にしている。
This brokerage company specializes in real estate transactions.
仲介業者 is a more general term for an intermediary or mediator, while 仲立ち営業 specifically refers to a brokerage company as a business entity.
Compound of 仲立ち (なかだち, 'mediation, intermediary') and 営業 (えいぎょう, 'business, operations').