D.C. Mun. Regs. tit. 11-D, § 702
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702.1
In the R-1A/WH and R-1B/WH zones, all residential buildings shall have a front setback equal to or greater than the average setback of all structures on the same side of the street in the block where the building in question is located as depicted in the map entitled, 'Required Front Yard Setbacks,' which is a part of this zone and located in the Office of Zoning and in the Office of the Zoning Administrator at the Department of Buildings.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 66 DCR 2337 (February 22, 2019); as amended by Final Rulemaking published at 66 DCR 13705 (October 18, 2019); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).