Where can I find out whether the previous property bidding is legal?

Housing security and real estate administration. Housing Security and Real Estate Management Bureau is an institution that implements national and provincial laws, regulations and policies on housing security, urban housing system reform and real estate transaction management. Property bidding is to pass the housing security and real estate administration for the record, and whether the previous property bidding is legal or not is checked by the housing security and real estate administration. Property management company is an enterprise-type economic entity with corresponding qualifications established in accordance with legal procedures and an independent enterprise legal person.