D.C. Mun. Regs. tit. 9, § 1109
1109.1 Qualified capital gain from the sale or exchange of QHTC assets held for more than five (5) years are excluded from the computation of District gross income.
1109.2 The amount of qualified capital gain shall not include gain which:
(a) Is attributable to real property or an intangible asset which is not an integral part of a QHTC; and
(b) Occurs before January 1, 2001 or after December 31, 2007.
SOURCE: Final Rulemaking published at 49 DCR 2142 (March 8, 2002).