National Property Act Article 52-2

The non-public use real property that has been used for building and dwelling since Dec.31, 1946 until now, the user shall, before Jan. 13, 2015, submit the relevant documents and apply for sale to the NPA or its branches. When the application is approved, the value of the land shall be valuated based on the first announced the present value of land if its area is less than 500㎡.
中文原文 國有財產法第52-2條
非公用財產類之不動產,於民國三十五年十二月三十一日以前已供建築、居住使用至今者,其直接使用人得於民國一百零四年一月十三日前,檢具有關證明文件,向財政部國有財產局或所屬分支機構申請讓售。
經核准者,其土地面積在五百平方公尺以內部分,得按第一次公告土地現值計價。

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