Under the following circumstances, final valuation of an estate and final imposition of tax shall be suspended until such time as, in the opinion of the Deputy Chief Financial Officer, sufficient facts are available for proper determination of the tax:
If, in the opinion of the Deputy Chief Financial Officer, circumstances other than those listed in § 206.1 are such that the tax should be suspended, the Deputy Chief Financial Officer shall authorize suspension; Provided, that in all cases, the imposition of the tax shall be suspended only with respect to that portion of the property which in the opinion of the Deputy Chief Financial Officer cannot be properly assessed.
If the nature of the property or the interest subject to the tax cannot be more certainly ascertained by postponing the valuation, the imposition of the tax shall not be postponed.
D.C. Mun. Regs. tit. 9, r. 9-206