Legal basis: Measures for the Administration of Commercial Housing Sales Article 34 A real estate development enterprise shall entrust a unit with real estate surveying and mapping qualifications to conduct surveying and mapping according to the project before the commercial housing is delivered for use, and the surveying and mapping results shall be reported to the real estate administrative department for examination and approval before being used for housing ownership registration. Real estate development enterprises shall, within 60 days from the date of delivery of commercial housing, submit the information required for housing ownership registration to the real estate administrative department where the housing is located. Real estate development enterprises shall assist the buyers of commercial housing to handle the procedures of land use right change and house ownership registration.