Board of Review Appeal Decision History

Historic land, building, and total assessed values for all Cook County parcels appealed with the Board of Review, from 2010 to present. The Board of Review uses these values for reporting, evaluating assessment performance over time, and research.

When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded

This data is parcel-level. Each row contains the assessed values for a single PIN for a single year. Important notes:
• Assessed values are available when the Board of Review closes appeals and certifies the values.
• The values in this data are assessed values, NOT market values. Assessed values must be adjusted by their level of assessment (https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf) to arrive at market value. Note that levels of assessment may have changed throughout the time period covered by this data set.
• This data set will be updated when each township is certified. However, note that there may be discrepancies between the Board of Review’s data and the Assessor's site and this data set, as each pull from a slightly different system.
• Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website (https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf). Note that class codes details can change across time.
• The Change Reason and No Change Reason fields are only populated starting with the 2015 year data.

All data provided here is prepared for internal purposes by the County of Cook only is provided to the public as a courtesy.

While efforts have been made to be as accurate as possible, Cook County provides the data for personal use “as is”. The data is not guaranteed to be accurate, correct, or complete. Information provided should not be used as a substitute for legal, business, tax, or other professional advice. The recipient/viewer should contact appropriate regulating agencies to determine accuracy or suitability of the data for a particular use. This data may not be used in states that do not allow the exclusion or limitation of incidental or consequential damages.

Cook County or its staff assume no liability whatsoever for any losses that might occur from the use, misuse, or inability to use its geospatial data, maps or websites. All materials appearing on a map, geospatial data or County web site are transmitted without warranty of any kind and are subject to the terms on this disclaimer.

自2010年起，本数据集收录了库克县所有向复审委员会申诉的土地、建筑及总评估价值的历史数据。复审委员会利用这些数据进行报告、评估评估业绩随时间的变化以及研究。在处理地块索引号（Parcel Index Numbers, PINs）时，请确保将它们补零至14位数字。部分数据集在下载时可能会丢失PINs的前导零。该数据集以地块为单位，每行包含单个PIN在单一年份的评估价值。以下为重要注意事项：
• 评估价值在复审委员会关闭申诉并确认价值后可用。
• 数据集中的价值为评估价值，而非市场价值。评估价值必须根据其评估级别进行调整（https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf），以得出市场价值。请注意，评估级别在数据集涵盖的时间段内可能有所变化。
• 数据集将在每个镇区通过认证时进行更新。然而，请注意，复审委员会的数据、评估员网站以及本数据集之间可能存在差异，因为每次提取的数据均来自略有不同的系统。
• 当前物业类别代码、其评估级别及描述可在评估员网站上找到（https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf）。请注意，类别代码详情可能随时间而变化。
• 从2015年起，变更原因（Change Reason）和无变更原因（No Change Reason）字段才有数据。
所有提供的数据均由库克县仅用于内部目的准备，现作为便利提供给公众。
尽管已尽力确保准确性，库克县提供的数据仅供参考，不保证其准确性、正确性或完整性。提供的信息不应替代法律、商业、税务或其他专业建议。接收者/查看者应联系适当的监管机构，以确定数据对特定用途的准确性或适用性。本数据不得用于不允许排除或限制意外或后果性损害的州。
库克县或其工作人员对使用、误用或无法使用其地理空间数据、地图或网站所导致的任何损失概不承担任何责任。地图、地理空间数据或县网站上的所有材料均以任何保证不提供，并受本免责声明条款的约束。