D.C. Mun. Regs. tit. 11, § 1517
1517.1 The FH/TSP Overlay District is mapped in combination with the underlying R-1, R-1-B, or R-2 District and not in lieu of the underlying district.
1517.2 Where there is a conflict between the FH/TSP Overlay District and an underlying zoning district, the more restrictive provisions of the FH/TSP shall govern.
SOURCE: Final Rulemaking published at 54 DCR 4835, 4841 (May 18, 2007).