Returns almost all of the land Maryland originally ceded to create Washington, D.C. back to the State of Maryland (retrocession) once Maryland enacts a law accepting the land and the President issues a proclamation. The bill preserves a much smaller area as the permanent Federal District under exclusive federal control, specifies which properties remain federal, updates which laws apply where, keeps many federal benefits and program rules in force for people who move from federal to state jurisdiction, and ties the effective date to either the Presidential proclamation or the repeal of the Twenty‑third Amendment, whichever happens later.