Computer Assisted Mass Appraisal - Commercial

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务与收入办公室（Office of Tax and Revenue）的计算机辅助批量评估（Computer-Assisted Mass Appraisal, CAMA）系统。该CAMA系统由不动产税务管理部门内的评估分部（Assessment Division, AD）使用，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不动产税评估名册中登记的在用不动产的交易历史记录，且每日更新。评估分部会持续维护交易数据，不断新增交易记录并更新已有数据内容。每日更新的数据均为从CAMA系统提取时的"快照"，且数据始终存在变更的可能。