Architects Act Article 6

A practicing architect shall have an office for practice; or the said architect may jointly open an office with two or more licensed architects. Such an office should be duly registered with the respective municipality, county/city authority under which jurisdiction the office is located. An architect may practice anywhere within the R.O.C.
中文原文 建築師法第6條
建築師開業,應設立建築師事務所執行業務,或由二個以上建築師組織聯合建築師事務所共同執行業務,並向所在地直轄市、縣(市)辦理登記開業且以全國為其執行業務之區域。

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