D.C. Code § 9-101.07

All the powers given to the Mayor and Council of the District of Columbia and others under §§ 9-103.01 to 9-103.05 shall apply to and be capable of being exercised upon and through Beatty and Hawkins’s Addition to Georgetown, where it may be necessary to connect streets in parts of the District lying outside of cities, or to connect any street in the city with streets in the District of Columbia.