If the wall of any house already erected cover 7 inches or more in width of the adjoining lot, it shall be deemed a party wall, according to the regulations for building in the District, and the ground so occupied more than 7 inches in width shall be paid for as provided in § 1-1325.
D.C. Code § 1-1326
Wall extending over lot line
Mar. 3, 1901, 31 Stat. 1426, ch. 854, § 1587
Official source: D.C. Law Library (Council of the District of Columbia). Reproduced from public-domain District of Columbia statutes; confirm against the official source for the current text. Not legal advice.