Implementation Regulations of Real Estate Broking Management Act Article 12

(1)After permit, a broking agency shall enter the business association in the near municipal administration office in a special municipality or a county (municipal) administration office before the installation of the local business association. (2)After the installation of local business association, the aforementioned broking agency shall enter it.
中文原文 不動產經紀業管理條例施行細則第12條
經紀業經許可後,所在地同業公會尚未設立者,應加入鄰近直轄市或縣(市)同業公會。
前項經紀業於所在地同業公會設立後,應即加入之。

English translation for reference only; the Chinese text prevails. Not legal advice.