Regulations on Real Estate Appraisal Article 4

A Real estate appraiser should regularly collect cases of comparable properties and information with respect to their transaction, income and cost, and also verify the reliability of collected information.The information specified in the preceding paragraph could be obtained from the persons concerned, neighbors, other real estate appraisers, real estate brokers, land administration agents, land administration departments, financial institutions, public land management institutions, judicial institutions, mass medias, or other relevant sectors.
中文原文 不動產估價技術規則第4條
不動產估價師應經常蒐集比較標的相關交易、收益及成本等案例及資料,並詳予求證其可靠性。
前項資料得向當事人、四鄰、其他不動產估價師、不動產經紀人員、地政士、地政機關、金融機構、公有土地管理機關、司法機關、媒體或有關單位蒐集之。

English translation for reference only; the Chinese text prevails. Not legal advice.