An estate in possession exists when the owner has an immediate right to the possession of the land.
D.C. Code § 42-507
Estate in possession
Mar. 3, 1901, 31 Stat. 1351, ch. 854, § 1017
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.