D.C. Mun. Regs. tit. 23, § 301
301.1 The four hundred foot (400 ft.) distance shall be measured in accordance with the provisions of § 101.2 of this title.
301.2 Nothing in D.C. Official Code § 25-333(a) shall be construed to prohibit the transfer by the same owner of a Retailer's license Class A to a new location that is located four hundred feet (400 ft.) or less from the original location and in an area zoned non-residential.
301.3 Nothing in D.C. Official Code § 25-333(b) shall be construed to prohibit the transfer by the same owner of a Retailer's license Class B to a new location that is located four hundred feet (400 ft.) or less from the original location and in an area zoned non-residential.
SOURCE: Final Rulemaking published at 35 DCR 4947 (June 24, 1988); as amended by Final Rulemaking published at 51 DCR 4309 (April 30, 2004); as amended by Final Rulemaking published at 55 DCR 12991 (December 26, 2008).