G Green open space in east jakarta, particularly in tanah mas housing, functions as an ecosystem buffer and water absorption area in accordance with law no. 26 of 2007, which requires a minimum of 30% of the city area. the conversion of 750 m² of rth for the kayu putih community health center was carried out because the rented building was not suitable, even though it reduced the rth proportion by 15.6% and violated the rdtr zoning. the research problem formulated in this study is whether the conversion of green open space into a community health center in tanah mas housing is in accordance with or violates law no. 26 of 2007 on spatial planning, and what the legal consequences would be if it does not comply with law no. 26 of 2007 on spatial planning. the research method used in this study is the normative juridical type with a descriptive-analytical approach, based on two sources of data: secondary data and primary data. the research data were analyzed using qualitative methods and conclusions were drawn using deductive logic. the result of this research is that the conversion of green open space for the construction of a community health center in tanah mas housing is not in accordance with law no. 26 of 2007 because it violates the obligation to comply with spatial planning, is carried out without proper amendment procedures, and disregards community participation. this violation has the potential to result in administrative sanctions (such as permit cancellation and demolition), criminal sanctions (imprisonment and fines), as well as civil liability to restore the environment and compensate for losses.