Legal basis: Measures for the Assessment of Expropriation of Houses on State-owned Land Article 12 A real estate appraisal institution shall arrange a registered real estate appraiser to conduct on-the-spot investigation on the expropriated houses, investigate the conditions of the expropriated houses, take photos and other video materials reflecting the internal and external conditions of the expropriated houses, make on-the-spot investigation records and keep them properly. The expropriated person shall assist the registered real estate appraiser to conduct on-the-spot investigation on the expropriated house, and provide or assist in collecting the information and materials needed for the value evaluation of the expropriated house. The house expropriation department, the expropriated person and the registered real estate appraiser shall sign or seal the field survey records for confirmation. If the expropriated person refuses to sign or seal the field survey record, it shall be witnessed by the house expropriation department, the registered real estate appraiser and the third party who has no interest, and the relevant information shall be explained in the evaluation report.