National Property Act Article 53

Non-public use vacant house, land with no specific use and its area is less than 1,650 square meters shall be sold by public tendering by the NPA. If its area is 1,650 square meters or more, it shall not be sold by public tendering.
中文原文 國有財產法第53條
非公用財產類之空屋、空地,並無預定用途,面積未達一千六百五十平方公尺者,得由財政部國有財產局辦理標售。
面積在一千六百五十平方公尺以上者,不得標售。

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