2. Inquiry of the Real Estate Bureau: If you want to inquire about the accurate information of the personal real estate license (including the name of the owner, the title certificate number, the date of registration and approval, the construction area, the design purpose of the house, the source of rights, whether the house is mortgaged, etc.). ), you must bring your personal identification and real estate license to the archives or window of the local housing authority (real estate trading center, housing authority, housing authority) for inquiry.