Housing Act Article 29

Where a private organization requires non-public use public land or building for social housing, the public property management authority may rent or set up superficies for the land and provide preferential treatment. Constraints of Article 28 of the National Property Act shall not apply.The abovementioned preferential treatment for rent and setting up superficies shall be prescribed by the Ministry of Finance jointly with the Ministry of the Interior.Where there are fragmentary or narrow pieces of public land in the building foundation required by the private organization, the authority for sales of public land shall sell the land according to the announced current land value.
中文原文 住宅法第29條
民間興辦之社會住宅,需用公有土地或建築物時,得由公產管理機關以出租、設定地上權提供使用,並予優惠,不受國有財產法第二十八條之限制。
前項出租及設定地上權之優惠辦法,由財政部會同內政部定之。
民間需用基地內夾雜零星或狹小公有土地時,應由出售公有土地機關依讓售當期公告土地現值辦理讓售。

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