D.C. Mun. Regs. tit. 14, § 5322
5322.1 All structure types may be utilized, including but not limited to single Family, duplex, triplex, fourplex, garden apartment, townhouses, and high-rises.
5322.2 Families may only rent units from relatives as reasonable accommodation for a disability, in accordance with DCHA's policy as stated in § 4900.3.
5322.3 Housing owned by DCHA is ineligible under the HCVP, as well as units where the Family is being subsidized under other Section 8 programs.
SOURCE: Final Rulemaking published at 59 DCR 7890 (June 29, 2012).