Land Administration Agent Act Article 31

A Land Administration Agent Guild shall be established in a Municipality or a County (City) once the number of registered Land Administration Agents exceeds 15. If the number of registered Land Administration Agents is less than 15, they could join a Guild in the neighboring jurisdiction or jointly organize a Guild with agents in the neighboring jurisdiction.
中文原文 地政士法第31條
直轄市或縣(市)已登記之地政士達十五人以上者,應組織地政士公會;其未滿十五人者,得加入鄰近公會或聯合組織之。

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