The assessed value of all real property shall be the proposed estimated market value established on or before January 1st of the year preceding the tax year, as determined by the Deputy Chief Financial Officer, except as follows:
The assessed value of a property shall be established on the basis of the most current, accurate, and conclusive evidence of market value available at the time the assessed value is determined, in accordance with the provisions of § 307.
The Deputy Chief Financial Officer is authorized to conduct exterior and interior inspection of a property if, in the Deputy Chief Financial Officer's judgment, an inspection is necessary in order to establish the assessed value of the property.
D.C. Mun. Regs. tit. 9, r. 9-306