In this study, the expert reports received from the court for 51 real estate parcels over the past 20 years have been examined and evaluated. The expert reports are from the urgent expropriation process as per Article 27 of the Expropriation Law No.2942, and these reports have frequently been used by public institutions. In expropriation cases, the income valuation method was used by the real estate experts. It has revealed that the zoning and usage characteristics of the real estate parcels were not taken into consideration sufficiently during valuation, the parameters used in the valuation of the real estate by the expert committee and the determination of structures, facilities and plants on the real estate parcels were incomplete. Important mistakes were made in updating the sales values of comparable real estate parcels and, in general, the quality of the valuation study remained at a low level. In order to minimize these errors, members of the expert committees should be trained and should possess sufficient experience in the field of land acquisition, expropriation and valuation. In these conditions, the valuation studies should be carried out by real estate development experts and the employment of the said experts should be made obligatory in all public institutions and companies that provide consultancy services to them. Furthermore, it is necessary and beneficial to establish a monitoring-evaluation system with the effective supervision of the expertise process.