Why is Wanhong City Garden illegal?

Due to poor management of residential property management companies and other factors, some owners have built some buildings (structures) on platforms and roofs, and these owners have not gone through relevant legal procedures in any department, which is illegal. Wanhong City Garden is located in Wanhong City Garden in East Street, Longquanyi District. The whole project of Wanhong City Garden covers an area of 56 mu, exceeding *** 138 1 household, with a plot ratio of 3.53 and a green space ratio of 34%. The whole community is a closed building layout, which consists of four elevators with 24+ 1 and five elevators with 65438.