Real Estate Appraiser Act Article 23

A Real Estate Appraiser Guild shall be established in a Municipality or a County (City) when the number of registered Real Estate Appraisers in this jurisdiction exceeds fifteen. In the case that the number of registered Real Estate Appraisers is less than fifteen, they could join a Guild in the neighboring Municipality or a County (City).
中文原文 不動產估價師法第23條
直轄市或縣(市)不動產估價師公會,以在該區域內開業之不動產估價師十五人以上發起組織之;其不滿十五人者,得加入鄰近直轄市或縣(市)之不動產估價師公會。

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