D.C. Mun. Regs. tit. 14, r. 14-4716
Portions of this chapter shall apply to a sale of a housing accommodation for which a contract had not been fully executed prior to June 3, 1980; or where a third party contract had been fully executed prior to June 3, 1980, and the period of tenant contracting pursuant to the Rental Housing Act had not expired prior to August 10, 1980. The regulations which shall apply in these instances are §§ 4711.1, 4711.5, 4711.6, 4711.11, 4711.12, 4711.13, 4712, 4713.2, 4713.3, 4714.3, 4714.4, 4715.7, 4715.8 and 4715.9.
An owner of a housing accommodation shall comply with all provisions of Title IV of the Act if notices of intent to sell pursuant to the Rental Housing Act had not been received at least fifty percent (50%) of the tenants in occupied units by June 3, 1980.
D.C. Mun. Regs. tit. 14, r. 14-4716