Legal analysis: materials required for access: business license, real estate development qualification certificate, authorization letter for inquiring credit information, legal person ID card, legal person resume, financial statements of the previous year and current period, five certificates, industrial and commercial articles of association, floor plan (unit price table), signing of house purchase contract, materials collected: mortgage: 4 commercial housing sales contracts, 2 filing forms, marital status statement 1 copy, and notice of pre-sale of commercial housing.

Legal basis: "Measures for the Administration of Commercial Housing Sales" Article 33 A real estate development enterprise shall be responsible for the quality warranty of the commercial housing it sells. Real estate development enterprises shall fulfill their warranty obligations and be responsible for the losses caused by quality problems within the warranty period.