It shall be the duty of the Administrator of General Services, within 90 days after the sale of any lots or squares belonging to the United States in the City of Washington, to report the fact to the proper officers of the District, giving the date of sale, the number of the lot and square, and the name of the purchaser; and such lots or squares shall be liable to taxation by the District from the day of sale.
D.C. Code § 47-709
Business improvement districts, "assessed value" defined, see § 2-1215.02. .