The mysterious courtyard in Yanjiao belongs to the state. According to the relevant public information, the mysterious courtyard in Yanjiao is located on the East Street of Palace in Yanjiao. It is an inconspicuous small courtyard, next to Fucheng Food Plaza, the former residence of Li Fucheng, the richest man in Yanjiao. There are still traces of residence here, which has been nationalized, and the guard room at the door is on duty.