Urban Planning Act Article 5
The urban plan shall be formulated on the basis of their present and past conditions and of an anticipated 25-year development.
中文原文 都市計畫法第5條
都市計畫應依據現在及既往情況，並預計二十五年內之發展情形訂定之。
English translation for reference only; the Chinese text prevails. Not legal advice.