Computer Assisted Mass Appraisal - Residential

Data source is the Office of Tax and Revenue’s Computer-Assisted Mass Appraisal (CAMA) system. The CAMA system is used by the Assessment Division (AD) within the Real Property Tax Administration to value real estate for ad valorem real property tax purposes. The intent of this data is to provide a sale history for active properties listed among the District of Columbia’s real property tax assessment roll. This data is updated daily. The AD constantly maintains sale data, adding new data and updating existing data. Daily updates represent a “snapshot” at the time the data was extracted from the CAMA system, and data is always subject to change.本数据集的数据源为税收与收入局（Office of Tax and Revenue）的计算机辅助批量评估（Computer-Assisted Mass Appraisal, CAMA）系统。该CAMA系统由不动产税收管理部门下属的评估分部（Assessment Division, AD）使用，专门用于开展从价计征不动产税所需的不动产价值评估工作。本数据集旨在提供哥伦比亚特区（District of Columbia）不动产税收评估名册中在册有效不动产的交易历史记录。本数据集每日更新。评估分部（AD）会持续维护交易数据，新增数据条目并更新既有信息。每日更新仅为从CAMA系统提取数据时刻的‘快照’，数据内容始终存在变更可能。