According to Clause 1, Article 15 of the "Procedures of the Shanghai Municipality on the Administration of Tree Planting, Afforestation, and Greening", the afforested area should not be less than 80% of the total area of green land, that is, as long as the green land in residential districts conforms with the regulation standards, it is permitted to set out gymnastic apparatus. However, real estate companies should enhance the administration and patrol in order to reduce the trampling of green land.