Legal basis: Notice of General Office of the State Council on Further Improving the Regulation of Real Estate Market. Municipalities directly under the central government, cities with separate plans, provincial capitals and cities with excessively high housing prices and rising too fast should strictly formulate and implement housing purchase restriction measures within a certain period of time. 1 Housing (including newly-built commercial housing and second-hand housing) is in principle limited to local registered households and non-local registered households that can provide local tax payment certificates or social insurance payment certificates for a certain number of years; For local registered households with two or more houses, non-local registered households with/kloc-0 houses, and non-local registered households that cannot provide local tax payment certificates or social insurance payment certificates for a certain number of years, it is necessary to suspend the sale of houses within their administrative areas. Cities that have taken measures to restrict the purchase of housing, which are inconsistent with the requirements of this notice, should immediately adjust and improve the relevant implementation rules, strengthen the audit of the qualifications of buyers, and ensure that the policies are in place. Municipalities directly under the central government, cities with separate plans, provincial capitals and cities with high housing prices and rising too fast should introduce detailed rules for the implementation of housing purchase restriction before mid-February. Other cities should also introduce housing purchase restrictions in a timely manner according to the new situation of the local real estate market.